drm/amd/display: add enable/disable dp link output to link_hwss

[why]
Factor enable/disable dp link output to link hwss.
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Acked-by: Wayne Lin <wayne.lin@amd.com>
Signed-off-by: Wenjing Liu <wenjing.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/core/dc_link.c

@@ -4016,8 +4016,10 @@ static void fpga_dp_hpo_enable_link_and_stream(struct dc_state *state, struct pi
 	decide_link_settings(stream, &link_settings);
 	stream->link->cur_link_settings = link_settings;
 
-	/*  Enable clock, Configure lane count, and Enable Link Encoder*/
-	enable_dp_hpo_output(stream->link, &pipe_ctx->link_res, &stream->link->cur_link_settings);
+	if (link_hwss->ext.enable_dp_link_output)
+		link_hwss->ext.enable_dp_link_output(stream->link, &pipe_ctx->link_res,
+				stream->signal, pipe_ctx->clock_source->id,
+				&link_settings);
 
 #ifdef DIAGS_BUILD
 	/* Workaround for FPGA HPO capture DP link data:

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

@@ -86,6 +86,14 @@ struct link_hwss_ext {
 			struct fixed31_32 throttled_vcp_size);
 	void (*set_throttled_vcp_size)(struct pipe_ctx *pipe_ctx,
 			struct fixed31_32 throttled_vcp_size);
+	void (*enable_dp_link_output)(struct dc_link *link,
+			const struct link_resource *link_res,
+			enum signal_type signal,
+			enum clock_source_id clock_source,
+			const struct dc_link_settings *link_settings);
+	void (*disable_dp_link_output)(struct dc_link *link,
+			const struct link_resource *link_res,
+			enum signal_type signal);
 };
 
 struct link_hwss {