soc/intel/common/uart: Restrict scope of uart_common_init to uart.c

uart_common_init is not used outside of
soc/intel/common/block/uart.c. This change restricts the scope to this
file and drops the declaration from uart.h

Change-Id: I499a53506f9b2e91ecc7334bf9b023d342e802fc
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49211
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/common/block/include/intelblocks/uart.h

@@ -23,12 +23,6 @@ struct uart_gpio_pad_config {
  * 4. SOC will allow common code to set UART into legacy mode if supported.
  */
 
-/*
- * Common routine to initialize UART controller PCI config space, take it out of
- * reset and configure M/N dividers.
- */
-void uart_common_init(const struct device *dev, uintptr_t baseaddr);
-
 /*
  * Check if UART debug controller is initialized
  * Returns:

src/soc/intel/common/block/uart/uart.c

@@ -58,7 +58,7 @@ static int uart_get_valid_index(void)
 	return UART_CONSOLE_INVALID_INDEX;
 }
 
-void uart_common_init(const struct device *device, uintptr_t baseaddr)
+static void uart_common_init(const struct device *device, uintptr_t baseaddr)
 {
 #if defined(__SIMPLE_DEVICE__)
 	pci_devfn_t dev = PCI_BDF(device);