msm: camera: icp: Cleanup FW message handling

Handling frame done result from firmware, additional error
checks are added in frame done processing. Using context
lock instead of frame process lock, because frame done message
is related to a firmware context.

Change-Id: Iec82da8c3bb6e3282cbf0987a10869e122070362
Signed-off-by: Suresh Vankadara <svankada@codeaurora.org>