Revert "mfd: wm5102: Manually apply register patch"

This reverts commit d9d03496.

It seems this commit was applied twice, once through ASoC and once
through MFD:

commit 4c9bb8bc
mfd: wm5102: Manually apply register patch

commit d9d03496
mfd: wm5102: Manually apply register patch

This has lead to a small piece of duplicate code. It is harmless hence
how it has gone unoticed for so long. This patch reverts one of the two
commits removing the unneeded code.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>