disp: msm: dp: use sde_drm.h shared header from techpack path

Update sde_drm.h header to use the display techpack path for
kernel-5.4.

Change-Id: I2b7dcbbde8128eece7a2a8a652f9f7c427b38110
Signed-off-by: Tatenda Chipeperekwa <tatendac@codeaurora.org>

msm/dp/dp_panel.h

@@ -6,7 +6,7 @@
 #ifndef _DP_PANEL_H_
 #define _DP_PANEL_H_
 
-#include <drm/msm_drm.h>
+#include <drm/sde_drm.h>
 
 #include "dp_aux.h"
 #include "dp_link.h"