Revert "ARM: dts: msm: Add DT properties to enable DP on sm6150 target"

This reverts 'commit 99dfab2c ("ARM: dts: msm: Add DT properties to enable
DP on sm6150 target")'. This change to enable DP is resulting in a failure
during bootup on sm6150.

Change-Id: I3b03f9dcec7c5e8d442371b61a768358593e4d65
Signed-off-by: Padmanabhan Komanduru <pkomandu@codeaurora.org>