ASoC: wcd: Fix ADSP based SVA mode detection failures

Updating bit 2 of WCD934X_CODEC_RPM_CLK_MCLK_CFG register
from both resource manager and wcd934x-dsp-cntl is leading
to improper MAD status while switching between SVA modes.
Change the existing implementation to update the above bit
only from enable/disable sequence of MAD widget.

CRs-Fixed: 1114031
Change-Id: Ia27f3d66701b6e2805ec594a4835a396faf21c2c
Signed-off-by: Karthik Reddy Katta <a_katta@codeaurora.org>
Signed-off-by: Banajit Goswami <bgoswami@codeaurora.org>