ARM: dts: msm: add MDSS support for 8939 v3.0 for CDP only

For 8939 v3.0, the DSI PHY regulator supports DCDC mode.
Update the DSI PHY regulator register settings set DCDC mode
for 8939-v3.0 CDP as default.

Change-Id: Ia5ac3d3b1c2341456006dffa1b73ad18bf58a755
Signed-off-by: Padmanabhan Komanduru <pkomandu@codeaurora.org>
Signed-off-by: Bikshapathi Kothapeta <c_bkotha@qti.qualcomm.com>
Signed-off-by: Sandeep Panda <spanda@codeaurora.org>
Signed-off-by: Sridhar Gujje <sgujje@codeaurora.org>
Signed-off-by: Bharat Pawar <bpawar@codeaurora.org>
Signed-off-by: Nirmal Abraham <nabrah@codeaurora.org>