ASoC: wcd-mbhc: Fix playback pause during lineout insertion

Playback pauses during aux cable insertion as removal of
cable is reported followed by insertion. Report removal
of current cable only when headset connected to other end
of extension cable and not lineout.

Change-Id: I08933f4a88493136a518ee72646aa10b1f06eb70
Signed-off-by: Vatsal Bucha <vbucha@codeaurora.org>