ARM: dts: msm: support wqxga panel and truly dsc mode on sdm660

Add the following support on sdm660:
1. Panel timings, power supplies, backlight settings for sharp
wqxga panel.
2. Panel timings for dsc video and command mode for truly panel.

Change-Id: I4f3a6794b8856f4df53717f81f980cf7ab1b73db
Signed-off-by: Ashish Garg <ashigarg@codeaurora.org>