ARM: dts: msm: delete DSC related dcs commands for 8996

Display driver generates a 128 bytes of DSC PPS (picture
parameters set) and sends it to configure and enable panel.
Therefore these DSC related dcs commands are not required.

Change-Id: I818419e5cc8b9573a4d58b749ce73f7083d8abea
Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>