CCodec: Allow bitrate to be not set in CQ mode for video encoders

In constant quality mode, bitrate field is optional for video encoders.
Update the check to look for quality for CQ Mode and bitrate for other
modes.

Bug: 125010575
Test: Manual with HEIF encoding application
Change-Id: Icb294e1becaf47c8fdabb6839d1aa57178e17737