ASoC: msm8x16-wcd: remove pdm and mclk disable for tx path

When rx and tx path are concurrently active, tearing down
the tx path brings down the pdm and mclk along with it. This
also causes pop in voice call scenarios.
Remove disable of these clocks from tx path to ensure
that they are disabled in the disable function common
to the tx and rx path.

CRs-Fixed: 776426
Change-Id: I58964b203e4389a192c0a53e7640336bdd45a4b7
Signed-off-by: Aravind Kumar <akumark@codeaurora.org>