test: Allow tests to run on any board

Due to a recent change, tests are limited to running on sandbox only.
Correct this so that any architecture can run them.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reported-by: Sean Anderson <seanga2@gmail.com>
Fixes: c79705ea ("test: Move dm_test_init() into test-main.c")
Tested-by: Sean Anderson <seanga2@gmail.com>
46 jobs for dm-pull-6apr21 in 44 minutes and 5 seconds (queued for 2 seconds)
latest
Status Name Job ID Coverage
  Testsuites
passed Build envtools #248456
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passed Build tools-only #248455
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passed Check for configs without MAINTAINERS entry #248454
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passed cppcheck #248450
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passed grep TODO/FIXME/HACK #248451
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passed htmldocs #248452
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passed Run binman, buildman, dtoc, Kconfig and patman testsuites #248457
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passed Run tests for Nokia RX-51 (aka N900) #248458
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passed sloccount #248453
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  Test.Py
passed evb-ast2500 test.py #248463
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passed integratorcp_cm926ejs test.py #248467
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passed qemu_arm64 test.py #248469
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passed qemu_arm test.py #248468
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passed qemu_malta64el test.py #248477
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passed qemu_malta64 test.py #248476
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passed qemu_maltael test.py #248475
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passed qemu_malta test.py #248474
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passed qemu_mips64el test.py #248473
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passed qemu_mips64 test.py #248472
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passed qemu_mipsel test.py #248471
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passed qemu_mips test.py #248470
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passed qemu-ppce500 test.py #248478
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passed qemu-riscv32_spl test.py #248481
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passed qemu-riscv32 test.py #248479
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passed qemu-riscv64_spl test.py #248482
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passed qemu-riscv64 test.py #248480
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passed qemu-x86_64 test.py #248484
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passed qemu-x86 test.py #248483
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passed r2dplus_i82557c test.py #248485
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passed r2dplus_pcnet test.py #248486
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passed r2dplus_rtl8139 test.py #248487
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passed r2dplus_tulip test.py #248488
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passed sandbox_flattree test.py #248464
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passed sandbox_noinst_test.py #248462
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passed sandbox_spl test.py #248461
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passed sandbox test.py #248459
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passed sandbox with clang test.py #248460
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passed vexpress_ca15_tc2 test.py #248465
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passed vexpress_ca9x4 test.py #248466
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passed xilinx_versal_virt test.py #248490
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passed xilinx_zynq_virt test.py #248489
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passed xtfpga test.py #248491
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  World Build
passed build all 32bit ARM platforms #248492
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passed build all 64bit ARM platforms #248493
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passed build all other platforms #248495
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passed build all PowerPC platforms #248494
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