Spelling fixes in arch/sh/.
Signed-off-by: NSimon Arlott <simon@fire.lp0.eu>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

The generic hardirq layer already takes care of a lot of the
appropriate locking and disabling for us, no need to duplicate
it in the handlers..
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

Formerly implemented by ADX, we can use this generically,
so move it over.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>