ARM: dts: msm: use dummy regulator for 3V eLDO supply of touch on Holi

The 3V eLDO controlled by gpio#53 is always ON, to avoid any conflict
with the ALS sensor that is also using the same GPIO.

Make use of a dummy regulator for the touch 3V supply.

Change-Id: Ie40ab4c27a9f10222ce4fbc77f51e65acefeff8b