rtc: sunplus: use devm_platform_ioremap_resource_byname()

Convert platform_get_resource_byname(),devm_ioremap_resource() to a single
call to devm_platform_ioremap_resource_byname(), as this is exactly what
this function does.

Signed-off-by: Ye Xingchen <ye.xingchen@zte.com.cn>
Link: https://lore.kernel.org/r/202303221131581039486@zte.com.cn
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Author: Ye Xingchen

drivers/rtc/rtc-sunplus.c

@@ -235,8 +235,7 @@ static int sp_rtc_probe(struct platform_device *plat_dev)
 	if (!sp_rtc)
 		return -ENOMEM;
 
-	sp_rtc->res = platform_get_resource_byname(plat_dev, IORESOURCE_MEM, RTC_REG_NAME);
-	sp_rtc->reg_base = devm_ioremap_resource(&plat_dev->dev, sp_rtc->res);
+	sp_rtc->reg_base = devm_platform_ioremap_resource_byname(plat_dev, RTC_REG_NAME);
 	if (IS_ERR(sp_rtc->reg_base))
 		return dev_err_probe(&plat_dev->dev, PTR_ERR(sp_rtc->reg_base),
 					    "%s devm_ioremap_resource fail\n", RTC_REG_NAME);