drm/v3d: Make use of the helper function devm_platform_ioremap_resource_byname()

Use the devm_platform_ioremap_resource_byname() helper instead of
calling platform_get_resource_byname() and devm_ioremap_resource()
separately
Signed-off-by: Cai Huoqing <caihuoqing@baidu.com>
Reviewed-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Melissa Wen <melissa.srw@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210901112941.31320-1-caihuoqing@baidu.com

drivers/gpu/drm/v3d/v3d_drv.c

@@ -206,10 +206,7 @@ MODULE_DEVICE_TABLE(of, v3d_of_match);
 static int
 map_regs(struct v3d_dev *v3d, void __iomem **regs, const char *name)
 {
-	struct resource *res =
-		platform_get_resource_byname(v3d_to_pdev(v3d), IORESOURCE_MEM, name);
-
-	*regs = devm_ioremap_resource(v3d->drm.dev, res);
+	*regs = devm_platform_ioremap_resource_byname(v3d_to_pdev(v3d), name);
 	return PTR_ERR_OR_ZERO(*regs);
 }