drm/msm/dp: perform USB3_DP_COM_PHY reset only when needed

The USB3_DP_COM_PHY reset needs to be performed in Display
Port driver when all 4 lanes are needed for Display Port. Avoid
this when the DP adapter supports USB3/DP concurrency.

Change-Id: Id16731fc8278fda532883b01b76046bd61df8cf7
Signed-off-by: Padmanabhan Komanduru <pkomandu@codeaurora.org>