ASoC: arizona: No need to update_bits when writing AEC clock control

The bits in the ARIZONA_CLOCK_CONTROL register only respond to writes of
a '1', a write of '0' is ignored. So there's no need to use update_bits.
We can do a simple write to set bits.

Signed-off-by: Richard Fitzgerald <rf@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>