c6x: Wire up asm-generic/xor.h

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Mark Salter <msalter@redhat.com>
Tested-by: Mark Salter <msalter@redhat.com>

arch/c6x/include/asm/Kbuild

@@ -55,3 +55,4 @@ generic-y += types.h
 generic-y += ucontext.h
 generic-y += user.h
 generic-y += vga.h
+generic-y += xor.h