skl mainboards/dt: Move usb{2,3}_ports settings into XHCI device scope

Change-Id: I22ba991a9d559b0ecc7b3ceddcfd099890dd6c3a
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/83171
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <ericllai@google.com>
Reviewed-by: Marvin Evers <marvin.n.evers@gmail.com>
Reviewed-by: Erik van den Bogaert <ebogaert@eltan.com>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
Reviewed-by: Jonathon Hall <jonathon.hall@puri.sm>
diff --git a/src/mainboard/purism/librem_skl/variants/librem13/overridetree.cb b/src/mainboard/purism/librem_skl/variants/librem13/overridetree.cb
index 18ce220..08cf745 100644
--- a/src/mainboard/purism/librem_skl/variants/librem13/overridetree.cb
+++ b/src/mainboard/purism/librem_skl/variants/librem13/overridetree.cb
@@ -1,17 +1,23 @@
 chip soc/intel/skylake
 
-	register "usb2_ports[0]" = "USB2_PORT_TYPE_C(OC_SKIP)"	# Type-C Port
-	register "usb2_ports[1]" = "USB2_PORT_MID(OC0)"		# Type-A Port (right)
-	register "usb2_ports[2]" = "USB2_PORT_MID(OC_SKIP)"	# Bluetooth
-	register "usb2_ports[3]" = "USB2_PORT_FLEX(OC_SKIP)"	# Camera
-	register "usb2_ports[5]" = "USB2_PORT_FLEX(OC2)"	# Type-A Port (left)
-	register "usb2_ports[6]" = "USB2_PORT_MID(OC_SKIP)"	# SD
+	device domain 0 on
+		device ref south_xhci on
+			register "usb2_ports" = "{
+				[0] = USB2_PORT_TYPE_C(OC_SKIP),	// Type-C Port
+				[1] = USB2_PORT_MID(OC0),		// Type-A Port (right)
+				[2] = USB2_PORT_MID(OC_SKIP),		// Bluetooth
+				[3] = USB2_PORT_FLEX(OC_SKIP),		// Camera
+				[5] = USB2_PORT_FLEX(OC2),		// Type-A Port (left)
+				[6] = USB2_PORT_MID(OC_SKIP),		// SD
+			}"
 
-	# OC1 should be for Type-C but it seems to not have been wired, according to
-	# the available schematics, even though it is labeled as USB_OC_TYPEC.
-	register "usb3_ports[0]" = "USB3_PORT_DEFAULT(OC_SKIP)"	# Type-C Port
-	register "usb3_ports[1]" = "USB3_PORT_DEFAULT(OC0)"	# Type-A Port (right)
-	register "usb3_ports[2]" = "USB3_PORT_DEFAULT(OC_SKIP)"	# Type-C Port
-
-	device domain 0 on end
+			# OC1 should be for Type-C but it seems to not have been wired, according to
+			# the available schematics, even though it is labeled as USB_OC_TYPEC.
+			register "usb3_ports" = "{
+				[0] = USB3_PORT_DEFAULT(OC_SKIP),	// Type-C Port
+				[1] = USB3_PORT_DEFAULT(OC0),		// Type-A Port (right)
+				[2] = USB3_PORT_DEFAULT(OC_SKIP),	// Type-C Port
+			}"
+		end
+	end
 end