serial: pch: Don't initialize uart_port's spin_lock.

There is no need to directly initialize the spinlock_t in struct
uart_port. The structure is later passed to uart_add_one_port() which
initialize the complete struct including the lock member.

Remove spin_lock_init() on uart_port's internal lock.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lore.kernel.org/r/20240301215246.891055-17-bigeasy@linutronix.deSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/pch_uart.c

@@ -1725,8 +1725,6 @@ static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
 		 KBUILD_MODNAME ":" PCH_UART_DRIVER_DEVICE "%d",
 		 priv->port.line);
 
-	spin_lock_init(&priv->port.lock);
-
 	pci_set_drvdata(pdev, priv);
 	priv->trigger_level = 1;
 	priv->fcr = 0;