kselftest/arm64: Make the tools/include headers available

Make the generic tools/include headers available to the arm64 selftests so
we can reduce some duplication.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230728-arm64-signal-memcpy-fix-v4-4-0c1290db5d46@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>

Author: broonie

tools/testing/selftests/arm64/Makefile

@@ -19,6 +19,8 @@ CFLAGS += -I$(top_srcdir)/tools/testing/selftests/
 
 CFLAGS += $(KHDR_INCLUDES)
 
+CFLAGS += -I$(top_srcdir)/tools/include
+
 export CFLAGS
 export top_srcdir