radix tree test suite: Depend on tools/include/asm files

Changing tools/include/asm/bug.h showed a missing dependency in the
Makefile.
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Reviewed-by: Rehas Sachdeva <aquannie@gmail.com>

tools/testing/radix-tree/Makefile

@@ -23,6 +23,7 @@ find_next_bit.o: ../../lib/find_bit.c
 
 $(OFILES): *.h */*.h \
 	../../include/linux/*.h \
+	../../include/asm/*.h \
 	../../../include/linux/radix-tree.h
 
 radix-tree.c: ../../../lib/radix-tree.c