alsa_sound: Support using legacy CAF input buffersize logic

Older CAF audio HALs only used getInputBufferSize for 5.1 channel
audio.  Newer CAF HALs use it in numerous other use cases too,
including for stereo audio recording.

This logic breaks with older kernels using the legacy CAF
logic for input buffer sizes.  Allow the board to force the old
logic.

Typical symptoms of needing this logic are if any form of
audio recording (including video recording in the camera)
fail.

Examples of affected CAF tags:
A8064AAAAANLYA101034
A8064AAAAANLYA1334

Change-Id: Idc79b63ee781d7a7ac7eed20bad261e1020abd65