ARM: mach-shmobile: sh7377/G4EVM evt2irq() update

This patch updates the irq numbers on sh7377/G4EVM
to make use of evt2irq() and intcs_evt2irq().

Makes the system cope with an updated INTCS_VECT_BASE.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>