msm: camera: Check for valid per frame i2c data.

Add check for valid i2c data per frame before
consuming in the flush request. This issue
reported in random stability

Change-Id: I43f90f1af714a2a4ae3efd86ec6e306c4fde802c
Signed-off-by: Shankar Ravi <rshankar@codeaurora.org>