ASoC: msm8x16-wcd: update power down sequence

Update register write sequence for speaker and headset devices
during device tear down.

For PMIC 2.0 and QCRG 2_0_7 version has changes in the QCRG sequence
update the code to match the QCRG.

CRs-Fixed: 680225, 680246
Change-Id: I9ddfc478665d936080fca40b004cdd32bd8579b1
Signed-off-by: Santosh Mardi <gsantosh@codeaurora.org>