ASoC: wcd9335: Avoid TX mute during voice call on headset

If long button is pressed to end the voice call, the button
click suppression block within wcd9335 hardware does not
release IN2_P causing TX mute for the next voice call session.
Avoid TX mute by force release IN2_P during every voice call
start.

CRs-fixed: 1013280
Change-Id: I5af41bef6db6af14d53018caef1f7fd9b00fc136
Signed-off-by: Phani Kumar Uppalapati <phaniu@codeaurora.org>