mm-video-v4l2: venc: support all I frame encoding usecase.

If nPframes is set to 0, component returns error. This fails
the usecase where client is configured for all I-frames
encoding. This change adds support for all I frame encoding
usecase.

Change-Id: I1d7e769258d2e0a151e03ba395b4d61045635c95
1 file changed