ARM: dts: msm: clean up display device tree for MSM8996

Display device setting for MSM8996 scattered in different files.
Need to clean up and consolidate display entries into platform
specific files.

Signed-off-by: Paresh Purabhiya <ppurab@codeaurora.org>
Change-Id: I49d45e77b9353c7f84f0f6058e15ed4b89e305d9