Update intc tables and platform data to use one linux irq
per maskable interrupt source instead of keeping the one-to-one
mapping between vectors and linux irqs.

This fixes potential irq masking issues for sh7785 hardware
blocks such as SCIF/DMAC/PCIC5/MMCIF/GDTA/FLCTL/GPIO
Signed-off-by: NMagnus Damm <damm@igel.co.jp>
Tested-by: NYoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>