mb/google/volteer/variants/drobit: Add TBT PCIE rp setting for drobit

Add the TBT PCIE rp setting to on and also fixes system hang
in recovery screen after selected "Power off" item problem.

BUG=b:177963941
BRANCH=firmware-volteer-13672.B
TEST=emerge-volteer coreboot chromeos-bootimage
     build Pass
     And check the system can power off normally in recovery page

Cq-Depend: chrome-internal:3581043
Signed-off-by: Wayne3_Wang <Wayne3_Wang@pegatron.corp-partner.google.com>
Change-Id: Ic0a4756b4af839ea0a23febb991bd71af7733dcc
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50103
Reviewed-by: Wayne3 Wang <wayne3_wang@pegatron.corp-partner.google.com>
Reviewed-by: Ariel Chang <ariel_chang@pegatron.corp-partner.google.com>
Reviewed-by: Zhuohao Lee <zhuohao@chromium.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/volteer/variants/drobit/overridetree.cb

@@ -60,6 +60,14 @@ chip soc/intel/tigerlake
 	}"
 
 	device domain 0 on
+		device ref tbt_pcie_rp0 on
+			probe DB_USB USB4_GEN3
+		end
+
+		device ref tbt_pcie_rp1 on
+			probe DB_USB USB4_GEN3
+		end
+
 		device ref i2c0 on
 			chip drivers/i2c/generic
 				register "hid" = ""10EC5682""