ASoC: audio-ext-clk: Add lpass mclk support

Codec MCLK control needs to be sent to AFE on lpass for californium to
be toggled on and off.

Change-Id: I2d271ab29e76b08904a91c92b19f6fd300a39701
Signed-off-by: Deven Patel <cdevenp@codeaurora.org>