ASoC: wcd9335: update impedance detection and mono/stereo mix controls

Add mixer controls to be exposed to userspace for getting impedance
detection and plug type whether mono or stereo.

Change-Id: I6b587a1c16f507acf99370725b3c098346c42d5e
Signed-off-by: Laxminath Kasam <lkasam@codeaurora.org>