ARM: mach-shmobile: sh73a0 PINT IRQ base fix

Bump up the sh73a0 PINT IRQ base from 768 to 800 to avoid
collision with INTCS vectors for IRQ16->IRQ32 at 0x3xxx.

Without this fix the sh73a0 IRQ pin handling code collides
with the PINT code which results in hangs on Kota2 during boot.

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