serial: 8250_dw: Fix typo "notifer"

There is a spelling mistake of 'notifer' in the comment which
should be 'notifier'.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: WangYuli <wangyuli@uniontech.com>
Link: https://lore.kernel.org/r/BD4804BF4FBA1648+20250722073431.21983-6-wangyuli@uniontech.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: WangYuli

drivers/tty/serial/8250/8250_dw.c

@@ -392,7 +392,7 @@ static void dw8250_set_termios(struct uart_port *p, struct ktermios *termios,
 	rate = clk_round_rate(d->clk, newrate);
 	if (rate > 0) {
 		/*
-		 * Note that any clock-notifer worker will block in
+		 * Note that any clock-notifier worker will block in
 		 * serial8250_update_uartclk() until we are done.
 		 */
 		ret = clk_set_rate(d->clk, newrate);