ARM: dts: msm: remove MDSS GDSC vote from dsi pll driver for Kona

Remove MDSS GDSC vote from DSI PLL as it is hardware controlled and
vote is not needed anymore. GDSC vote was adding unnecessary
delays in locking new clockrates during resolution switch
scenarios causing frame drops.

Change-Id: I538504732eea2ac9f757d3b22a8a833539ff6266