ASoC: sun8i-codec: Attach the bus clock to the regmap

When attached to the regmap, the bus clock is automatically enabled as
needed to access device registers. This avoids needing code to manage it
separately in the driver.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Acked-by: Maxime Ripard <mripard@kernel.org>
Link: https://lore.kernel.org/r/20200831034852.18841-9-samuel@sholland.org


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