disp: msm: dp: Move required drm_dp_link functions to downstream

On the latest kernel, several drm_dp_link functions were removed.
This change moves the functions needed downstream.

Change-Id: I0a76c52edff450d8bd33edffb9da41c1933b9681
Signed-off-by: Samantha Tran <samtran@codeaurora.org>
Signed-off-by: Nilaan Gunabalachandran <ngunabal@codeaurora.org>

msm/dp/dp_ctrl.c

@@ -544,7 +544,7 @@ static int dp_ctrl_link_train(struct dp_ctrl_private *ctrl)
 		ctrl->link->link_params.bw_code);
 	link_info.capabilities = ctrl->panel->link_info.capabilities;
 
-	ret = drm_dp_link_configure(ctrl->aux->drm_aux, &link_info);
+	ret = dp_link_configure(ctrl->aux->drm_aux, &link_info);
 	if (ret)
 		goto end;