tty: serial: samsung: simplify getting OF match data

Simplify the code with of_device_get_match_data() and use dev_of_node()
to remove ifdef-erry.
Tested-by: Alim Akhtar <alim.akhtar@samsung.com>
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/20220308080919.152715-9-krzysztof.kozlowski@canonical.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/samsung_tty.c

@@ -2147,23 +2147,14 @@ static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
 
 /* Device driver serial port probe */
 
-#ifdef CONFIG_OF
-static const struct of_device_id s3c24xx_uart_dt_match[];
-#endif
-
 static int probe_index;
 
 static inline const struct s3c24xx_serial_drv_data *
 s3c24xx_get_driver_data(struct platform_device *pdev)
 {
-#ifdef CONFIG_OF
-	if (pdev->dev.of_node) {
-		const struct of_device_id *match;
+	if (dev_of_node(&pdev->dev))
+		return of_device_get_match_data(&pdev->dev);
 
-		match = of_match_node(s3c24xx_uart_dt_match, pdev->dev.of_node);
-		return (struct s3c24xx_serial_drv_data *)match->data;
-	}
-#endif
 	return (struct s3c24xx_serial_drv_data *)
 			platform_get_device_id(pdev)->driver_data;
 }