sh: TMU platform data for sh7722

This patch adds TMU platform data for sh7722. Only clockevent
mode is enabled for now, clocksource requires this patch:
"clocksource: setup mult_orig in clocksource_enable()"

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>