Merge the SDHI vectors for sh7377 using the recently
merged INTC force_enable/disable feature.

With this in place SDHI hotplug is supported using
the drivers sh_mobile_sdhi and tmio_mmc.
Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>