C2SoftAvcDec: Increase maximum output delay to 34

AVC specification allows for a delay of 32 fields and libavc
decoder has an additional delay of 2 calls in returning output.

Bug: 163127030
Test: poc in bug
Test: atest android.mediav2.cts
Change-Id: Iad21bddc2c802ca018f2adc65f56ba5ffb33c8ec