mm-video-v4l2: venc: fix slice mode max bytes

Due to incorrect condition, client setting slice size to bytes
is getting skipped, which resulting output slice size 512 bytes.
Correct slice mode max bytes logic to set value properly.

Change-Id: I83978937f4061fce22ac1a5a01f4641a7d4e92c0
CRs-Fixed: 1042183
1 file changed