ASoC: jz4740-i2s: Add support for the JZ4770

Before the JZ4770, the playback and capture sampling rates had to match.
The JZ4770 supports independent sampling rates for both.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Link: https://lore.kernel.org/r/20200306222931.39664-6-paul@crapouillou.net


Signed-off-by: Mark Brown <broonie@kernel.org>