ARM: mach-shmobile: sh73a0: fixup PINT/IRQ16-IRQ31 irq number conflict

Current IRQ16-IRQ31 irq number are located around 800 from
1ee8299a
(ARM: mach-shmobile: Use 0x3400 as INTCS vector offset)

But, the PINT0/1 IRQ number are also located around 800 from
0df1a838
(ARM: mach-shmobile: sh73a0 PINT IRQ base fix)

This patch relocates PINT0/1 IRQ number to around 700 where is not used,
and adds current IRQ location table in comment area.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>