ASoC: wcd9335: Update slim RX port disconnect sequence

Issue slim slave port disconnect command to tear
down the audio playback path and then wait for
the channel removal interrupt from the slimbus slave.
This is required because of the slim protocol (pull
mode) being used for 44.1KHz native audio playback.
If MSM side slimbus channels are closed first followed
by slim slave ports, it will lead to underflow errors
at the end of audio playback with 44.1KHz sample rate.
To avoid underflow errors, slim slave port disconnect
command is issued explicitly.

Change-Id: I1b6008193d63403e4904ccfa3d0e93286d748a1b
Signed-off-by: Phani Kumar Uppalapati <phaniu@codeaurora.org>