platform/surface: aggregator_registry: add entry for fan speed

Add an entry for the fan speed function.
Add this new entry to the Surface Pro 9 group.

Signed-off-by: Ivor Wanders <ivor@iwanders.net>
Link: linux-surface/kernel#144
Reviewed-by: Maximilian Luz <luzmaximilian@gmail.com>
Patchset: surface-sam

drivers/platform/surface/surface_aggregator_registry.c

@@ -74,6 +74,12 @@ static const struct software_node ssam_node_tmp_pprof = {
 	.parent = &ssam_node_root,
 };
 
+/* Fan speed function. */
+static const struct software_node ssam_node_fan_speed = {
+	.name = "ssam:01:05:01:01:01",
+	.parent = &ssam_node_root,
+};
+
 /* Tablet-mode switch via KIP subsystem. */
 static const struct software_node ssam_node_kip_tablet_switch = {
 	.name = "ssam:01:0e:01:00:01",
@@ -319,6 +325,7 @@ static const struct software_node *ssam_node_group_sp9[] = {
 	&ssam_node_bat_ac,
 	&ssam_node_bat_main,
 	&ssam_node_tmp_pprof,
+	&ssam_node_fan_speed,
 	&ssam_node_pos_tablet_switch,
 	&ssam_node_hid_kip_keyboard,
 	&ssam_node_hid_kip_penstash,