score: Wire up asm-generic/xor.h

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

arch/score/include/asm/Kbuild

@@ -3,3 +3,4 @@ header-y +=
 
 generic-y += clkdev.h
 generic-y += trace_clock.h
+generic-y += xor.h