ARM: dts: msm: Add us-euro gpio switch configuration

Add us-euro-gpios to control the mic-gnd switch
for msm8996 target. It is needed for EU/US headset
detection.

Change-Id: I6cf12d693a842e2a6b4066db21ed649fa48ede25
Signed-off-by: Phani Kumar Uppalapati <phaniu@codeaurora.org>