mb/google/brya/var/kinox: Disable thunderbolt interface

Disable all of the TBT devices in devicetree since kinox doesn't support
thunderbolt. The change also need to disable TBT in fitimage
(chrome-internal:4731094).

BUG=b:231654363
TEST=Build and run on DUT.

Signed-off-by: Dtrain Hsu <dtrain_hsu@compal.corp-partner.google.com>
Change-Id: I944680dd1f41ac6f375015a3a138eb00c41b58a7
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64087
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/mainboard/google/brya/variants/kinox/overridetree.cb

@@ -234,6 +234,10 @@ chip soc/intel/alderlake
 			end
 		end
 
+		device ref tbt_pcie_rp0 off end
+		device ref tbt_pcie_rp1 off end
+		device ref tbt_pcie_rp2 off end
+
 		device ref tcss_dma0 off end
 		device ref tcss_dma1 off end