Disable fast capture for non PCM

The frame count for compressed format record threads is not, in general,
pcm referred and equals the HAL buffer size (because the frame size for
compressed format threads is 1). The capture buffer size in milliseconds
cannot be known in advance for compresed formats because the bitrate of
the compressed stream is not known ahead of time, so disable the fast
path.

Test: media.audio_flinger dumpsys and check RecordThread for e-ac3-joc
      does not have fast capture enabled.
Change-Id: Ibbfd9375481679f7a2d92e36ec1ab9a5e6f42b40