ARM: shmobile: Use sh73a0 suffix for INTC compat string

Add "renesas,intc-irqpin-sh73a0" to the compatible string for the
IRQ pins in case of sh73a0 INTC. This makes the INTC irqpin follow
the same style as the other devices and also makes it more future proof.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>