drm/amd/display: Remove unwanted drm edid references

[WHY]
edid_override and drm_edid_override_connector_update, according to drm
documentation, should not be referred outside drm_edid.

[HOW]
Remove and replace them accordingly. This can tested by IGT's
kms_hdmi_inject test.
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -6461,15 +6461,23 @@ amdgpu_dm_connector_late_register(struct drm_connector *connector)
 static void amdgpu_dm_connector_funcs_force(struct drm_connector *connector)
 {
 	struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
+	struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector);
 	struct dc_link *dc_link = aconnector->dc_link;
 	struct dc_sink *dc_em_sink = aconnector->dc_em_sink;
 	struct edid *edid;
 
-	if (!connector->edid_override)
+	/*
+	 * Note: drm_get_edid gets edid in the following order:
+	 * 1) override EDID if set via edid_override debugfs,
+	 * 2) firmware EDID if set via edid_firmware module parameter
+	 * 3) regular DDC read.
+	 */
+	edid = drm_get_edid(connector, &amdgpu_connector->ddc_bus->aux.ddc);
+	if (!edid) {
+		DRM_ERROR("No EDID found on connector: %s.\n", connector->name);
 		return;
+	}
 
-	drm_edid_override_connector_update(&aconnector->base);
-	edid = aconnector->base.edid_blob_ptr->data;
 	aconnector->edid = edid;
 
 	/* Update emulated (virtual) sink's EDID */
@@ -6504,30 +6512,26 @@ static int get_modes(struct drm_connector *connector)
 
 static void create_eml_sink(struct amdgpu_dm_connector *aconnector)
 {
+	struct drm_connector *connector = &aconnector->base;
+	struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(&aconnector->base);
 	struct dc_sink_init_data init_params = {
 			.link = aconnector->dc_link,
 			.sink_signal = SIGNAL_TYPE_VIRTUAL
 	};
 	struct edid *edid;
 
-	if (!aconnector->base.edid_blob_ptr) {
-		/* if connector->edid_override valid, pass
-		 * it to edid_override to edid_blob_ptr
-		 */
-
-		drm_edid_override_connector_update(&aconnector->base);
-
-		if (!aconnector->base.edid_blob_ptr) {
-			DRM_ERROR("No EDID firmware found on connector: %s ,forcing to OFF!\n",
-					aconnector->base.name);
-
-			aconnector->base.force = DRM_FORCE_OFF;
-			return;
-		}
+	/*
+	 * Note: drm_get_edid gets edid in the following order:
+	 * 1) override EDID if set via edid_override debugfs,
+	 * 2) firmware EDID if set via edid_firmware module parameter
+	 * 3) regular DDC read.
+	 */
+	edid = drm_get_edid(connector, &amdgpu_connector->ddc_bus->aux.ddc);
+	if (!edid) {
+		DRM_ERROR("No EDID found on connector: %s.\n", connector->name);
+		return;
 	}
 
-	edid = (struct edid *) aconnector->base.edid_blob_ptr->data;
-
 	aconnector->edid = edid;
 
 	aconnector->dc_em_sink = dc_link_add_remote_sink(