drm/amd/display: Add register key and status for edid

[Why]
Register key for AE or QA do regression test.  New edid status for
check.

[How]
Add register key edid_read_retry_times.
Add new edid status EDID_FALL_BACK.
Signed-off-by: Jing Zhou <Jing.Zhou@amd.com>
Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Acked-by: Eryk Brol <eryk.brol@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -466,6 +466,7 @@ struct dc_debug_options {
 	bool scl_reset_length10;
 	bool hdmi20_disable;
 	bool skip_detection_link_training;
+	bool edid_read_retry_times;
 	bool remove_disconnect_edp;
 	unsigned int force_odm_combine; //bit vector based on otg inst
 #if defined(CONFIG_DRM_AMD_DC_DCN3_0)

drivers/gpu/drm/amd/display/dc/dc_types.h

@@ -177,6 +177,7 @@ enum dc_edid_status {
 	EDID_NO_RESPONSE,
 	EDID_BAD_CHECKSUM,
 	EDID_THE_SAME,
+	EDID_FALL_BACK,
 };
 
 enum act_return_status {