mb/google/rex: Add Hayden Bridge (HB) to USB_DB FW_CONFIG

This patch increases FW_CONFIG for USB_DB to 3-bits.

BUG=b:273346973
TEST=Able to build and boot google/rex with Proto 2 SKU

Signed-off-by: Subrata Banik <subratabanik@google.com>
Change-Id: Ib07ba1d54e7f7e2b09a99438529e503d9c9edb7d
Reviewed-on: https://review.coreboot.org/c/coreboot/+/73719
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>

src/mainboard/google/rex/variants/rex0/overridetree.cb

@@ -21,11 +21,12 @@ fw_config
 		option SD_ABSENT		0
 		option SD_GL9755S		1
 	end
-	field DB_USB 12 13
+	field DB_USB 12 14
 		option USB_UNKNOWN		0
 		option USB3_PS8815		1
 		option USB4_KB8010		2
 		option USB4_ANX7452		3
+		option USB4_HAYDEN_BRIDGE	4
 	end
 end