greybus: audio: Add I2S_RX path related settings

Capture path related settings during startup, perpare &
hwparams were earlier missing.

Signed-off-by: Vaibhav Agarwal <vaibhav.agarwal@linaro.org>
Reviewed-by: Mark Greer <mgreer@animalcreek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>