ARM: S5PV310: Add I2C channel 0, 1 and 2 support

This patch adds configuration of proper mux pins for support
I2C channel 0, 1, and 2 on S5PV310/S5PC210.

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
[kgene.kim@samsung.com: coding-style and minor comment fixes]
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>