tty: serial: samsung: constify s3c24xx_serial_drv_data members

The driver data (struct s3c24xx_serial_drv_data) is never modified, so
also its members can be made const.  Except code style this has no
impact because the structure itself is always a const.
Tested-by: Alim Akhtar <alim.akhtar@samsung.com>
Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/20220308080919.152715-7-krzysztof.kozlowski@canonical.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/samsung_tty.c

@@ -85,9 +85,9 @@ struct s3c24xx_uart_info {
 };
 
 struct s3c24xx_serial_drv_data {
-	struct s3c24xx_uart_info	info;
-	struct s3c2410_uartcfg		def_cfg;
-	unsigned int			fifosize[CONFIG_SERIAL_SAMSUNG_UARTS];
+	const struct s3c24xx_uart_info	info;
+	const struct s3c2410_uartcfg	def_cfg;
+	const unsigned int		fifosize[CONFIG_SERIAL_SAMSUNG_UARTS];
 };
 
 struct s3c24xx_uart_dma {