mb/google/rex: Disable TBT PCIe rp1 and rp3 root ports

Rex board only uses TBT PCIe root ports 0 and 2. This change disables
rp1 and rp3 root ports.

BUG=b:254207628
TEST=Booted to OS and verified rp1 and rp3 root ports were disabled.

Change-Id: Ia5c1d657c0ad0482619d739f8949bc9168eac25b
Signed-off-by: zhaojohn <john.zhao@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68854
Reviewed-by: Subrata Banik <subratabanik@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tarun Tuli <taruntuli@google.com>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
diff --git a/src/mainboard/google/rex/variants/rex0/overridetree.cb b/src/mainboard/google/rex/variants/rex0/overridetree.cb
index 2e1c159..c14077b 100644
--- a/src/mainboard/google/rex/variants/rex0/overridetree.cb
+++ b/src/mainboard/google/rex/variants/rex0/overridetree.cb
@@ -136,9 +136,7 @@
 			}"
 		end	#PCIE11 SD card
 		device ref tbt_pcie_rp0 on end
-		device ref tbt_pcie_rp1 on end
 		device ref tbt_pcie_rp2 on end
-		device ref tbt_pcie_rp3 on end
 		device ref tcss_xhci on
 			chip drivers/usb/acpi
 				device ref tcss_root_hub on