ASoC: 88pm860x: Use regmap for I/O

As part of a move to remove the duplication of regmap functionality in ASoC
convert the 88pm860x driver to use the regmap from the MFD. This means that
we no longer cache the registers so performance will be slightly reduced
on I/O operations.

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

diff --cc sound/soc/codecs/88pm860x-codec.c
Simple merge

diff --cc sound/soc/codecs/88pm860x-codec.h
Simple merge