selftests/powerpc: Only run some tests on ppc64le

These tests are currently failing on (some) big endian systems. Until
we can fix that, skip them unless we're on ppc64le.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

tools/testing/selftests/powerpc/tm/tm-vmxcopy.c

@@ -46,6 +46,7 @@ int test_vmxcopy()
 	uint64_t aborted = 0;
 
 	SKIP_IF(!have_htm());
+	SKIP_IF(!is_ppc64le());
 
 	fd = mkstemp(tmpfile);
 	assert(fd >= 0);