drm/amd/display: fix duplicated inclusion

Generated by: scripts/checkincludes.pl
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: kernel test robot <lkp@intel.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/core/dc_link_dpia.c

@@ -31,7 +31,6 @@
 #include "dc_link_dp.h"
 #include "dpcd_defs.h"
 #include "link_hwss.h"
-#include "inc/link_dpcd.h"
 #include "dm_helpers.h"
 #include "dmub/inc/dmub_cmd.h"
 #include "inc/link_dpcd.h"