clk: qcom: mdss: Program the DP PHY to enable all the DP lanes

All the DP lanes are not getting powered on during link training.
This is happening because of the swapped lane mapping in sm6150
target. Adding changes to power on all the lanes of DP PHY.

Change-Id: I9b39011a6d11ded5fd29d300254a938630eb185f
Signed-off-by: Sankeerth Billakanti <sbillaka@codeaurora.org>