mb/google/rex: Allocate resources for PCIe TBT root port

This patch selects the SOC_INTEL_ENABLE_USB4_PCIE_RESOURCES to allocate
TBT/USB4 root port resources for PCIe tunneling.

BUG=b:248328015
TEST=Built image and verified TBT/USB4 tunneling functions on Rex.

Change-Id: I69f4d26bb7b3d74dbda068add284a69f1bbeff40
Signed-off-by: zhaojohn <john.zhao@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/67781
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subratabanik@google.com>

src/mainboard/google/rex/Kconfig

@@ -25,6 +25,7 @@ config BOARD_GOOGLE_BASEBOARD_REX
 	select MAINBOARD_HAS_CHROMEOS
 	select MEMORY_SOLDERDOWN
 	select SOC_INTEL_METEORLAKE
+	select SOC_INTEL_ENABLE_USB4_PCIE_RESOURCES
 	select SYSTEM_TYPE_LAPTOP
 	select TPM_GOOGLE_TI50