ASoC: jz4740-i2s: fix function name

This driver is not related to I2C protocol.

s/_i2c_/_i2s_/

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
Acked-by: Paul Cercueil <paul@crapouillou.net>
Link: https://lore.kernel.org/r/56f9c8518870263698b00d10de4821d2dc8932be.1619960935.git.hns@goldelico.com


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