ASoC: fsl_micfil: Remove unneeded ifdef's

There is no need to use ifdef's around the power managament
related functions, as they are already using the __maybe_unused
notation.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Link: https://lore.kernel.org/r/20200518185448.6116-1-festevam@gmail.com


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