drm/amd/display: Remove unused headers

They're not being used, so remove them.
Signed-off-by: NImad Syed <imad.syed@amd.com>
Reviewed-by: NTony Cheng <Tony.Cheng@amd.com>
Acked-by: NLeo Li <sunpeng.li@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

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

@@ -43,10 +43,6 @@
 #include "dpcd_defs.h"
 #include "dmcu.h"
 
-#include "dce/dce_11_0_d.h"
-#include "dce/dce_11_0_enum.h"
-#include "dce/dce_11_0_sh_mask.h"
-
 #define DC_LOGGER_INIT(logger)