drm/amd/display: Add a clock source to a sharing pipe

Fix to allow DVI displays to share the same clock source
Signed-off-by: Mikita Lipski <mikita.lipski@amd.com>
Reviewed-by: Roman Li <Roman.Li@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -2536,7 +2536,7 @@ enum dc_status resource_map_clock_resources(
 		pipe_ctx->clock_source = NULL;
 
 		if (!dc->config.disable_disp_pll_sharing)
-			resource_find_used_clk_src_for_sharing(
+			pipe_ctx->clock_source = resource_find_used_clk_src_for_sharing(
 				&context->res_ctx,
 				pipe_ctx);