UPSTREAM: ASoC: rockchip: i2s: compatible with different chips

UPSTREAM: ASoC: rockchip: i2s: compatible with different chips

there maybe more than one i2s module inside chip, and these i2s modules
have different channels features.

for example: there are 3 i2s in rk3066, one support 8 channels playback
and 2 channels capture, but the others only support 2 channels playback
and 2 channels capture.

in order to compatible with these various chips, we add playback and
capture property to specify these values.

there are default channels configuration in driver: 8 channels playback
and 2 channels capture. if not add property, we use the default values.

Change-Id: I45f3214160877223ba9722bd38a36584e416b14d
Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit c4f9374ddc461ed76be30f4d354a6d1ecb94dfa5)