h8300: Wire up asm-generic/xor.h

crypto/xor.c:25:21: fatal error: asm/xor.h: No such file or directory
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

arch/h8300/include/asm/Kbuild

@@ -5,3 +5,4 @@ generic-y += linkage.h
 generic-y += mmu.h
 generic-y += module.h
 generic-y += trace_clock.h
+generic-y += xor.h