skl mainboards/dt: Move SsicPortEnable setting into XHCI device scope

Change-Id: I64ffba35303c1291f56ae6a038325a7482158ad3
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/83189
Reviewed-by: Eric Lai <ericllai@google.com>
Reviewed-by: Marvin Evers <marvin.n.evers@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/intel/kblrvp/variants/rvp11/overridetree.cb b/src/mainboard/intel/kblrvp/variants/rvp11/overridetree.cb
index 8a3161a..9d4c0d9 100644
--- a/src/mainboard/intel/kblrvp/variants/rvp11/overridetree.cb
+++ b/src/mainboard/intel/kblrvp/variants/rvp11/overridetree.cb
@@ -41,10 +41,6 @@
 	# RP17, uses CLK SRC 7
 	register "PcieRpClkSrcNumber[16]" = "7"
 
-	# USB related
-	register "SsicPortEnable" = "1"
-
-
 	register "SerialIoDevMode" = "{
 		[PchSerialIoIndexI2C0]  = PchSerialIoPci,
 		[PchSerialIoIndexI2C1]  = PchSerialIoPci,
@@ -66,6 +62,8 @@
 
 	device domain 0 on
 		device ref south_xhci on
+			register "SsicPortEnable" = "1"
+
 			register "usb2_ports" = "{
 				[0] = USB2_PORT_MID(OC_SKIP),	/* OTG */
 				[1] = USB2_PORT_MID(OC3),	/* Touch Pad */