msm: camera: add s5k4e1 camera driver for msm8x12 qrd board

Add driver form s5k4e1 camera sensor, also enable it's clock.
It's a 5 MP bayer Sensor, with 2 mipi lane.

Change-Id: I961b358fd34752df2addc06a75ee61ff58174abf
Signed-off-by: yuyang <yuyang@codeaurora.org>