drm/msm/dp: send VDM_CONFIGURE event to USB driver when needed

Some dongles/adapters set the port to DFP_D as part of the attention
message when the dongle is connected and not as part of the VDM_STATUS
callback command. Send the VDM_CONFIGURE command to USB driver and
return callback for such cases. This is needed to perform PIN
configuration of the dongle and initialize DisplayPort host. Handling
HPD high needs to be performed after that.

Change-Id: I5566d7b5a75484f6ae6bb5a6a735564d7fbf98b5
Signed-off-by: Padmanabhan Komanduru <pkomandu@codeaurora.org>