drm/amd/display: Remove unused variable

Remove an unused variable "remove_disconnect_edp" which was a workaround
bit.
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Acked-by: Alan Liu <HaoPing.Liu@amd.com>
Signed-off-by: Jun Lei <Jun.Lei@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -683,7 +683,6 @@ struct dc_debug_options {
 	bool hdmi20_disable;
 	bool skip_detection_link_training;
 	uint32_t edid_read_retry_times;
-	bool remove_disconnect_edp;
 	unsigned int force_odm_combine; //bit vector based on otg inst
 	unsigned int seamless_boot_odm_combine;
 	unsigned int force_odm_combine_4to1; //bit vector based on otg inst