CCodecConfig: Fix mapping to bitrate-mode

bitrate-mode was not mapped from c2 params to sdk params

Also fix typecast of bitrate mode while checking config params
for quality/bitrate. It was wrongly typecast to c2 enum

Test: Manual using a test application using AMediaCodec api
Bug: 133241887

Change-Id: I2544a7cbb4001152197b9ec164fe94b1a6da40d3