ASoC: codecs: Add PM suspend routines for digital codec

Digital codec soc suspend enables mclk, preventing XO shutdown.
So implement digital codec pm suspend to disable mclk. Add ignore
suspend property to new widgets to resolve powering up and down
during suspend.

Change-Id: I2a773cdfe25d408d95f1c07be71fd4be740e8bf0
Signed-off-by: Divya Ojha <dojha@codeaurora.org>