Revert "Add automatic rate detection and channels detection rather than hard coding. Cap at 48Khz due to popping most likely". Does not work on Pi due to issues in snd_bcm2835 driver: snd1_pcm_hw_param_get_min: Assertion `!snd_interval_empty(i)' failed.

This reverts commit 403fa7116d1c6e1c5e02dc403449f84c489d5574.