ARM: dts: msm: update the mdss pll resources for MSM8916

Update the configuration of 8916_L6 regulator needed for mdss
pll with the recommended settings. This avoids unnecessary
delay during DSI VCO configuration and PLL enable sequence.

Change-Id: Ic110313a26be5e0cde914c55e0f4b02642fd0534
Signed-off-by: Padmanabhan Komanduru <pkomandu@codeaurora.org>