msm: camera: Free buffers from frame queue at open
Free all pending frames in frame queue before cam_frame
thread opens frame device to avoid duplication of buffer
free

CRs-Fixed: 318202
Change-Id: I25d1718a37a94fa83563c4b6e99a1b7560917a7f
Signed-off-by: Suresh Vankadara <svankada@codeaurora.org>
Signed-off-by: Darescu Ionut <johnny@esi.ro>