ARM: dts: msm: modify HDMI configuration for msm8996 auto ADP/CDP

Automotive use case requirement is to have HDMI display as non-pluggable.
This change also set a custom mode as 1920x1080p@60Hz.

Change-Id: Ic2baec180d51dc6a91eaf72c44df1da066f04d2e
Signed-off-by: Rahul Sharma <sharah@codeaurora.org>