msm: camera: Restructure CSI components

Instead of sensor controlling CSI modules, move it user space
and configure it through media controller. This is to make
all v4l2 sub devs to function independently without the knowledge
of other sub devs.

Change-Id: Ie37dad8cb393f0b8deb65f330469e38eb374ba40
Signed-off-by: Sreesudhan Ramakrish Ramkumar <srramku@codeaurora.org>