msm: camera: utils: Save cell-index into soc info

Save the cell-index value read from dt node into
soc info structure, read reg-cam-base values
only when reg-names exists, few typo corrections
in comment headers.

CRs-Fixed: 2019539
Change-Id: If48e5448d17052efbaa34900ab283588d055d4b9
Signed-off-by: Pavan Kumar Chilamkurthi <pchilamk@codeaurora.org>