ASoC: da7213: add default clock handling

This adds default clock/PLL configuration to the driver
for usage with generic drivers like simple-card for usage
with a fixed rate clock.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Reviewed-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
Link: https://lore.kernel.org/r/20200626164623.87894-1-sebastian.reichel@collabora.com
Signed-off-by: Mark Brown <broonie@kernel.org>