drm/amd/display: Remove unused fields from dc_caps

[Why & How]
Identify few unused fileds in dc_caps. Remove them.
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Wayne Lin <wayne.lin@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -261,10 +261,7 @@ struct dc_caps {
 	bool zstate_support;
 	bool ips_support;
 	uint32_t num_of_internal_disp;
-	uint32_t max_dwb_htap;
-	uint32_t max_dwb_vtap;
 	enum dp_protocol_version max_dp_protocol_version;
-	bool spdif_aud;
 	unsigned int mall_size_per_mem_channel;
 	unsigned int mall_size_total;
 	unsigned int cursor_cache_size;
@@ -1370,7 +1367,6 @@ struct dc_plane_info {
 	int  global_alpha_value;
 	bool input_csc_enabled;
 	int layer_index;
-	bool front_buffer_rendering_active;
 	enum chroma_cositing cositing;
 };