ARM: S5P: Add platform support for MIPI CSIS devices

There may be up to two MIPI CSI slave interfaces depending on the SoC version.

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