when trellis quantizaiton is disabled, the b_quantizer should be used.
existing code has a lot of hard coded flag not hooked up correctly with
high level trellis quantization enable/disable flag, which causes
fp_quantizer is used. this patch is intended to remove the hard coded
flags and correctly get them from the high level control.

Change-Id: I0142aace03586d07aedea138fce08d3e72d99c32