drm/amd/display: remove duplicate dcn314 includes

Several headers were included twice.  Fix that.
Reported-by: kernel test robot <yujie.liu@intel.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: André Almeida <andrealmeid@igalia.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn314/dcn314_hwseq.c

@@ -34,7 +34,6 @@
 #include "clk_mgr.h"
 #include "reg_helper.h"
 #include "abm.h"
-#include "clk_mgr.h"
 #include "hubp.h"
 #include "dchubbub.h"
 #include "timing_generator.h"

drivers/gpu/drm/amd/display/dc/dcn314/dcn314_optc.c

@@ -25,7 +25,6 @@
  */
 
 #include "dcn314_optc.h"
-#include "dcn314_optc.h"
 
 #include "dcn30/dcn30_optc.h"
 #include "dcn31/dcn31_optc.h"

drivers/gpu/drm/amd/display/dc/dcn314/dcn314_resource.c

@@ -60,7 +60,6 @@
 #include "dcn31/dcn31_hpo_dp_stream_encoder.h"
 #include "dcn31/dcn31_hpo_dp_link_encoder.h"
 #include "dcn31/dcn31_apg.h"
-#include "dcn31/dcn31_dio_link_encoder.h"
 #include "dcn31/dcn31_vpg.h"
 #include "dcn31/dcn31_afmt.h"
 #include "dce/dce_clock_source.h"