ASoC: wcd9320: remove runtime PM voting

All the codec reads/writes go through slimbus satellite driver on APPS.
Slimbus satellite driver is already voting for slimbus clock before any
codec read or write so remove the vote from codec driver

Change-Id: If54f33739ff82b9388fa9417ef0f6152a4cddeea
Signed-off-by: Vidyakumar Athota <vathota@codeaurora.org>