selftests: Add infrastructure for powerpc selftests
This commit adds a powerpc subdirectory to tools/testing/selftests, for tests that are powerpc specific. On other architectures nothing is built. The makefile supports cross compilation if the user sets ARCH and CROSS_COMPILE. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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