drm/amd/display: Remove unused P010 debug flag

Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Mike Hsieh <chun-wei.hsieh@amd.com>
Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -484,7 +484,6 @@ struct dc_debug_options {
 	bool performance_trace;
 	bool az_endpoint_mute_only;
 	bool always_use_regamma;
-	bool p010_mpo_support;
 	bool recovery_enabled;
 	bool avoid_vbios_exec_table;
 	bool scl_reset_length10;