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

Agah doesn't support TBT interface so disable it in devicetree, for
fitimage configuration is at chrome-internal:4846869.

BUG=b:224423318
TEST=Build and check DUT boots.

Change-Id: I1eb43e86de5debf24ebde6eace14fe04bad5e5b1
Signed-off-by: Tony Huang <tony-huang@quanta.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65699
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/google/brya/variants/agah/overridetree.cb b/src/mainboard/google/brya/variants/agah/overridetree.cb
index 007b188..550dab6 100644
--- a/src/mainboard/google/brya/variants/agah/overridetree.cb
+++ b/src/mainboard/google/brya/variants/agah/overridetree.cb
@@ -59,6 +59,12 @@
         }"
 
         device domain 0 on
+		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
 		device ref pcie4_0 on
 			# Enable CPU PCIe RP 1 using CLKREQ 0 and CLKSRC 0
 			register "cpu_pcie_rp[CPU_RP(1)]" = "{