selftests/powerpc: Fix build break caused by EXPORT_SYMBOL changes
The changes to make EXPORT_SYMBOL work in asm, specifically commit 9445aa1a ("ppc: move exports to definitions"), in the kbuild tree, breaks some of our selftests. That is because we symlink the kernel code into the selftest, and shim the required headers, and we are now missing asm/export.h So create a minimal export.h to keep the tests building once powerpc and the kbuild trees are merged. Signed-off-by:Michael Ellerman <mpe@ellerman.id.au>
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