ASoC: arizona: FLL freerun only required whilst disabling

The FLL freerun is only required whilst we disable the FLL not the
entire time the FLL is disabled. This patch moves the FLL freerun
disable from the enable sequence to the disable sequence.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@linaro.org>