Use mechanical switch on the phone jack to detect headset/headphone insertion and removal. Mechanical switch is beneficial to avoid fake button press and high impedance microphone headset detection. CRs-fixed: 341402 Change-Id: Idffba14316ab25e07736d1b7385f0edb16216089 Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>