ASoC: jz4740-i2s: Remove Open Firmware dependency

This driver doesn't require Open Firmware support. Remove the
OF-specific includes and drop the Kconfig dependency.

Signed-off-by: Aidan MacDonald <aidanmacdonald.0x0@gmail.com>
Acked-by: Paul Cercueil <paul@crapouillou.net>
Link: https://lore.kernel.org/r/20220706211330.120198-2-aidanmacdonald.0x0@gmail.com


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