ASoC: msm: msm_bg: Remove regulator control from machine driver

Moving the control to enable or disable the regulator to codec
driver as it also has to configure the codec with initial params.

Change-Id: I63f506b09b76af0a8cd1331ebf1fd731a269f2cc
Signed-off-by: Ashish Jain <ashishj@codeaurora.org>
Signed-off-by: Swetha Vucha <swethav@codeaurora.org>