drm/amd/display: Set emulated sink type to HDMI accordingly.

[WHY & HOW]
Virtual sink is not audio-capable and this causes kms_hdmi_inject's
inject-audio to fail. Set it to HDMI according to EDID.
Reviewed-by: Chao-kai Wang <stylon.wang@amd.com>
Acked-by: Roman Li <roman.li@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -6513,6 +6513,9 @@ static void create_eml_sink(struct amdgpu_dm_connector *aconnector)
 		return;
 	}
 
+	if (drm_detect_hdmi_monitor(edid))
+		init_params.sink_signal = SIGNAL_TYPE_HDMI_TYPE_A;
+
 	aconnector->edid = edid;
 
 	aconnector->dc_em_sink = dc_link_add_remote_sink(