ARM: dts: msm: remove us-euro gpio from sound node APQ8909

APQ8009 IoE HW does not have support for EURO headset support.
Hence removing the GPIO from sound node, which is used to enable
mic-gnd swapping.

Change-Id: Ib1581e48bd50e1214257d0e0f905bf9903501b20
Signed-off-by: Viraja Kommaraju <virajak@codeaurora.org>