disp: msm: dp: remove check for peer_usb_comm

Reset the QMP PHY into DP-only mode only when the adapter/cable
connected is not multi-function capable. We remove the
peer_usb_comm check since this flag is not being updated when
the cable is connected.

Change-Id: Iafbdf73b3ef827b757b51bfadfa6fa16b840ac27
Signed-off-by: Tatenda Chipeperekwa <tatendac@codeaurora.org>