greybus: gb-audio: Fix DAI formats and master/slave settings

Set the various DAI formats so the bridge on the module
is the master of all clocks and the codec is the slave.
The only DAI protocol currently supported is I2S.

Signed-off-by: Mark A. Greer <mgreer@animalcreek.com>
Acked-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>