Based on the registration of davinci-mcasp.1 in the davinci-evm platform
setup for da830 and dm6467, davinci-pcm can handle more than the currently
reported maximum channels of 2.

Increase the maximum channels to 384 to match the maximum reported by
davinci-mcasp.1.
Signed-off-by: NBen Gardiner <bengardiner@nanometrics.ca>
Reviewed-by: NSteven Faludi <stevenfaludi@nanometrics.ca>
Acked-by: NLiam Girdwood <lrg@ti.com>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>