selftests: kselftest_deps.sh: Support LLVM

The kselftest_deps.sh script currently takes a compiler as the first
argument and uses it to check that libraries needed by the selftests
are installed.  This works well for GCC where a separate binary is
provided for each target architecture but is less of a good fit for
LLVM where a single compiler binary can target all of the supported
architetures.  Extend the script to accept "LLVM" as the compiler with
an additional optional ARCH= argument so that it can be used when
building with LLVM in a similar fashion to how the actual build works.

The duplication with the main Makefile isn't ideal here.

Link: https://lore.kernel.org/r/20261013-kselftest-deps-llvm-v1-1-f2ee70ae1b79@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

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