ARM: dts: msm: add display DT changes for 8939 MTP and CDP

Add support for the default display panel on 8939 MTP and CDP.
Add the DT entries for the MSM GPIOs and backlight control
needed for display in the respective DT files.
Also add the pinctrl active and suspend configuration for MDSS for
8939 MTP and CDP.

Change-Id: Ic7e52af54061ced36dc97e95aca42e8b057e9d4a
Signed-off-by: Radhika Ranjan Soni <rrsoni@codeaurora.org>
Signed-off-by: Padmanabhan Komanduru <pkomandu@codeaurora.org>