mm-video-v4l2: venc: fix the initial value for P/B frames

The codes for auto enable B-frame have been moved to
kernel driver, no need to enable B-frame by default in HAL.
Set default P-frame number use correct fps value.

Change-Id: Ic0c6be05d0c99d2962b9a2656bb20ed47dcf2836
1 file changed