drm/amd/display: Drop pixel_clock_mhz

The pixel_clock_mhz property is populated in amdgpu_dm when Freesync is setup,
but it is not used anywhere in amdgpu_dm. Remove the dead code.

Cc: chiahsuan.chung@amd.com
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -11519,7 +11519,6 @@ void amdgpu_dm_update_freesync_caps(struct drm_connector *connector,
 
 		amdgpu_dm_connector->min_vfreq = 0;
 		amdgpu_dm_connector->max_vfreq = 0;
-		amdgpu_dm_connector->pixel_clock_mhz = 0;
 		connector->display_info.monitor_range.min_vfreq = 0;
 		connector->display_info.monitor_range.max_vfreq = 0;
 		freesync_capable = false;
@@ -11583,8 +11582,6 @@ void amdgpu_dm_update_freesync_caps(struct drm_connector *connector,
 					connector->display_info.monitor_range.min_vfreq;
 				amdgpu_dm_connector->max_vfreq =
 					connector->display_info.monitor_range.max_vfreq;
-				amdgpu_dm_connector->pixel_clock_mhz =
-					range->pixel_clock_mhz * 10;
 
 				break;
 			}

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h

@@ -686,7 +686,6 @@ struct amdgpu_dm_connector {
 	 * value is set to zero when there is no FreeSync support.
 	 */
 	int max_vfreq ;
-	int pixel_clock_mhz;
 
 	/* Audio instance - protected by audio_lock. */
 	int audio_inst;