msm: camera: csiphy: Add logic to program userspace settle count

Currently settle count is programmed from hardware register data value
metioned in bring up sequence. It is more reliable and suitable to
program the value coming from userspace as that value is more accurate
with respect to sensor specific datarate. This change add logic to
accomplish that operation.

CRs-Fixed: 2759031
Change-Id: I87215b206632d15e2d51d6383345d2ffa16b6b9f
Signed-off-by: Jigarkumar Zala <jzala@codeaurora.org>