vidc: 1080p: Copy input frame tag to the output frame tag

In slice delivery mode, sometimes video hardware is giving
zero frame tag on output slices instead of input frame tag
value. This commit will fix the issue by copying the input
frame tag value to the output slice frame tag when video
hardware gives zero frame tag values.

Change-Id: Id766a4801422d0d1f769f15a35dfd948d5c51535
Signed-off-by: Maheshwar Ajja <majja@codeaurora.org>
Signed-off-by: Ramakrishna Prasad N <crpn@codeaurora.org>