msm: camera: Validate and adjust exposure setting

While changing between preview and snapshot modes, different
frame length line is configured. Coarse integration time may
become invalid for some frame length line values. Validate and
reconfigure frame length line while switching between modes

CRs-fixed: 356564
Change-Id: I4b0f3b9525b11a3590610acb69434ad8a19f9552
Signed-off-by: Sreesudhan Ramakrish Ramkumar <srramku@codeaurora.org>