sandbox: define __dyn_sym_start, dyn_sym_end

On RISC-V the symbols __dyn_sym_start, dyn_sym_end are referenced in
efi_runtime_relocate().

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
46 jobs for dm-pull-28mar21 in 62 minutes and 52 seconds (queued for 2 seconds)
latest
Status Name Job ID Coverage
  Testsuites
passed Build envtools #245384
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passed Build tools-only #245383
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passed Check for configs without MAINTAINERS entry #245382
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passed cppcheck #245378
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passed grep TODO/FIXME/HACK #245379
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passed htmldocs #245380
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passed Run binman, buildman, dtoc, Kconfig and patman testsuites #245385
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passed Run tests for Nokia RX-51 (aka N900) #245386
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passed sloccount #245381
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  Test.Py
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passed integratorcp_cm926ejs test.py #245395
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passed qemu_arm64 test.py #245397
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passed qemu_malta64el test.py #245405
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passed qemu_mips64el test.py #245401
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passed qemu_mipsel test.py #245399
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passed qemu-ppce500 test.py #245406
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passed qemu-riscv32_spl test.py #245409
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passed qemu-riscv32 test.py #245407
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passed qemu-riscv64_spl test.py #245410
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passed qemu-riscv64 test.py #245408
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passed qemu-x86_64 test.py #245412
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passed qemu-x86 test.py #245411
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passed r2dplus_i82557c test.py #245413
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passed r2dplus_pcnet test.py #245414
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passed r2dplus_rtl8139 test.py #245415
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passed r2dplus_tulip test.py #245416
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passed sandbox_flattree test.py #245392
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passed sandbox_noinst_test.py #245390
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passed sandbox_spl test.py #245389
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passed sandbox test.py #245387
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passed sandbox with clang test.py #245388
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passed vexpress_ca15_tc2 test.py #245393
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passed vexpress_ca9x4 test.py #245394
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passed xilinx_versal_virt test.py #245418
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passed xilinx_zynq_virt test.py #245417
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passed xtfpga test.py #245419
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  World Build
passed build all 32bit ARM platforms #245420
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passed build all 64bit ARM platforms #245421
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passed build all other platforms #245423
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passed build all PowerPC platforms #245422
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