Nokia RX-51: Add check for /lib/ld-linux.so.2 in test script

Unfortunately for testing is required qflasher which works only in 32-bit
x86 mode. Apparently 64-bit x86 Azure CI has no problems as it has
preinstalled 32-bit libraries and can execute also 32-bit x86 executables.

This change just show human readable output why nokia_rx51_test.sh test
script fails.

Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Link: https://lore.kernel.org/r/20210618133108.32497-1-pali@kernel.org
40 jobs for ti-v2021.10-rc1 in 31 minutes and 8 seconds (queued for 7 seconds)
latest
Status Name Job ID Coverage
  Testsuites
passed Build envtools #294529

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passed Build tools-only #294528

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passed Check for configs without MAINTAINERS entry #294527

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passed cppcheck #294523

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passed grep TODO/FIXME/HACK #294524

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passed htmldocs #294525

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passed Run binman, buildman, dtoc, Kconfig and patman testsuites #294530

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passed Run tests for Nokia RX-51 (aka N900) #294531

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passed sloccount #294526

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  Test.Py
passed evb-ast2500 test.py #294536

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passed integratorcp_cm926ejs test.py #294538

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passed qemu_arm64 test.py #294540

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passed qemu_arm test.py #294539

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passed qemu_malta64el test.py #294544

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passed qemu_malta64 test.py #294543

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passed qemu_maltael test.py #294542

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passed qemu_malta test.py #294541

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passed qemu-ppce500 test.py #294545

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passed qemu-riscv32_spl test.py #294548

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passed qemu-riscv32 test.py #294546

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passed qemu-riscv64_spl test.py #294549

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passed qemu-riscv64 test.py #294547

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passed qemu-x86_64 test.py #294551

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passed qemu-x86 test.py #294550

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passed r2dplus_i82557c test.py #294552

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passed r2dplus_pcnet test.py #294553

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passed r2dplus_rtl8139 test.py #294554

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passed r2dplus_tulip test.py #294555

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passed sandbox_flattree test.py #294537

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passed sandbox_noinst_test.py #294535

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passed sandbox_spl test.py #294534

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passed sandbox test.py #294532

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passed sandbox with clang test.py #294533

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passed xilinx_versal_virt test.py #294557

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passed xilinx_zynq_virt test.py #294556

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passed xtfpga test.py #294558

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  World Build
passed build all 32bit ARM platforms #294559

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passed build all 64bit ARM platforms #294560

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passed build all other platforms #294562

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passed build all PowerPC platforms #294561

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