serial: Prefer unsigned int to bare use of unsigned

Fix checkpatch warnings:
WARNING: Prefer 'unsigned int' to bare use of 'unsigned'
Signed-off-by: NJinchao Wang <wjc@cdjrlc.com>
Link: https://lore.kernel.org/r/20210624021207.58059-1-wjc@cdjrlc.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/mvebu-uart.c

@@ -617,7 +617,7 @@ static void mvebu_uart_putc(struct uart_port *port, int c)
 
 static void mvebu_uart_putc_early_write(struct console *con,
 					const char *s,
-					unsigned n)
+					unsigned int n)
 {
 	struct earlycon_device *dev = con->data;
 

drivers/tty/serial/xilinx_uartps.c

@@ -1149,7 +1149,7 @@ static void cdns_uart_console_putchar(struct uart_port *port, int ch)
 }
 
 static void cdns_early_write(struct console *con, const char *s,
-				    unsigned n)
+				    unsigned int n)
 {
 	struct earlycon_device *dev = con->data;