msm: ais: sync to latest mobile camera

Synching to mobile camera kernel from msm-4.14.

Up to commit 91071ebc
("msm: camera: isp: Fix possible uninitialized variable").

Change-Id: I9b38551acc9c273dd967355c5b47a2489c15e4ad
Signed-off-by: Terence Ho <terenceh@codeaurora.org>