ARM: msm: dts: add property to populate headset switch types.

Add property part of sound device tree node to populate headset
HPHL and GND switch type, typically the switch will be normally
open or normally closed.

Change-Id: I08a223d230f3f1664f64255bab3f02470573cb09
Signed-off-by: Santosh Mardi <gsantosh@codeaurora.org>