ARM: mach-shmobile: sh7372: Add I2C0, I2C1 support

sh7372 chip has 2 INTC.
Then, I2C0 is connected to INTCS, and I2C1 is connected to INTCA.
Both of these has no GPIO settings.

Signed-off-by: Kuninori Morimoto <morimoto.kuninori@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>