drm/amd/display: Enable 8k60hz mode on single display

[Why]

8k60hz compliace test failing because we restrict it single memory
channels. Workaround by not restricting it on single displays.

[How]

Adding an additional check to DCN314 to restrict 8k60hz mode if it has
more than 1 display connected.
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Acked-by: Stylon Wang <stylon.wang@amd.com>
Signed-off-by: Nicholas Susanto <nicholas.susanto@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn314/dcn314_resource.c

@@ -1689,7 +1689,9 @@ static bool filter_modes_for_single_channel_workaround(struct dc *dc,
 		struct dc_state *context)
 {
 	// Filter 2K@240Hz+8K@24fps above combination timing if memory only has single dimm LPDDR
-	if (dc->clk_mgr->bw_params->vram_type == 34 && dc->clk_mgr->bw_params->num_channels < 2) {
+	if (dc->clk_mgr->bw_params->vram_type == 34 &&
+	    dc->clk_mgr->bw_params->num_channels < 2 &&
+	    context->stream_count > 1) {
 		int total_phy_pix_clk = 0;
 
 		for (int i = 0; i < context->stream_count; i++)