kernel: Move REPEAT_BYTE definition into linux/kernel.h

And make sure that everything using it explicitly includes
that header file.

Signed-off-by: David S. Miller <davem@davemloft.net>
modified for Mako kernel from kernel.org

Signed-off-by: faux123 <reioux@gmail.com>

Conflicts:
	arch/x86/include/asm/word-at-a-time.h