soc/intel/pantherlake: Use common UART device list driver

Remove platform-specific uart.c and switch to the common UART device
list driver. This eliminates duplicate code.

The pantherlake uart.c simply defined uart_devices[] array. The common
driver now handles this using the PCI_UART_DEVFN macro defined in
pci_devs.h.

This commit:
- Selects SOC_INTEL_COMMON_FEATURE and
  SOC_INTEL_COMMON_FEATURE_UART_DEVICES in Kconfig
- Removes uart.c and updates Makefile.mk

Change-Id: I59443ece21bc45c8b6986fdd2bc24dd9ccf7a543
Signed-off-by: Jeremy Compostella <jeremy.compostella@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/91244
Reviewed-by: Kim, Wonkyu <wonkyu.kim@intel.com>
Reviewed-by: Pranava Y N <pranavayn@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/pantherlake/Kconfig

@@ -96,6 +96,8 @@ config SOC_INTEL_PANTHERLAKE_BASE
 	select SOC_INTEL_COMMON_BLOCK_TRACEHUB
 	select SOC_INTEL_COMMON_BLOCK_XHCI
 	select SOC_INTEL_COMMON_BLOCK_XHCI_ELOG
+	select SOC_INTEL_COMMON_FEATURE
+	select SOC_INTEL_COMMON_FEATURE_UART_DEVICES
 	select SOC_INTEL_COMMON_FSP_RESET
 	select SOC_INTEL_COMMON_PCH_CLIENT
 	select SOC_INTEL_COMMON_RESET

src/soc/intel/pantherlake/Makefile.mk

@@ -11,7 +11,6 @@ all-y += gspi.c
 all-y += i2c.c
 all-y += pmutil.c
 all-y += spi.c
-all-y += uart.c
 all-y += gpio.c
 
 bootblock-y += bootblock/bootblock.c
@@ -53,7 +52,6 @@ smm-y += gpio.c
 smm-y += p2sb.c
 smm-y += pmutil.c
 smm-y += smihandler.c
-smm-y += uart.c
 smm-y += xhci.c
 CPPFLAGS_common += -I$(src)/soc/intel/pantherlake
 CPPFLAGS_common += -I$(src)/soc/intel/pantherlake/include

src/soc/intel/pantherlake/uart.c

@@ -1,12 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-
-#include <commonlib/helpers.h>
-#include <soc/pci_devs.h>
-
-const unsigned int uart_devices[] = {
-	PCI_DEVFN_UART0,
-	PCI_DEVFN_UART1,
-	PCI_DEVFN_UART2,
-};
-
-const int uart_devices_size = ARRAY_SIZE(uart_devices);