ARM: dts: Add pinctrl entries for Exynos4x12 FIMC-IS peripherals

Add pinctrl nodes for the ISP I2C0, ISP I2C1 and ISP UART devices.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>