soc/intel/meteorlake: Make use of is_devfn_enabled() function

The patch uses is_devfn_enabled() function to enable the TBT PCIe ports
through FSP-M and FSP-S UPDs. Also, removes unused tbt_pcie_port_disable
array member from soc_intel_meteorlake_config struct.

TEST=Build coreboot for Google/Rex

Signed-off-by: Sridhar Siricilla <sridhar.siricilla@intel.com>
Change-Id: Ie55e196bd8f682864b8f74dbe253f345d7184753
Reviewed-on: https://review.coreboot.org/c/coreboot/+/67831
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>

src/soc/intel/meteorlake/chip.h

@@ -125,7 +125,6 @@ struct soc_intel_meteorlake_config {
 	uint16_t usb3_wake_enable_bitmap;
 	/* Program OC pins for TCSS */
 	struct tcss_port_config tcss_ports[MAX_TYPE_C_PORTS];
-	uint8_t tbt_pcie_port_disable[4];
 	/* Validate TBT firmware authenticated and loaded into IMR */
 	bool tbt_authentication;