[media] s5p-mfc: Fix frame skip bug

[media] s5p-mfc: Fix frame skip bug

The issue was seen in VP8 decoding where the last frame was
skipped by the driver. This patch gets the correct frame_type value
to fix the bug.

Signed-off-by: Arun Kumar K <arun.kk@samsung.com>
Signed-off-by: Arun Mankuzhi <arun.m@samsung.com>
BUG=220645

Change-Id: I1784803e3b692afa22d4aa8c966c9f325a20aafd
Reviewed-on: https://gerrit.chromium.org/gerrit/44437
Reviewed-by: Pawel Osciak <posciak@chromium.org>
Tested-by: John Sheu <sheu@chromium.org>
Commit-Queue: John Sheu <sheu@chromium.org>