drm/tiny: move to devm_platform_ioremap_resource() usage

Replace platform_get_resource + devm_ioremap_resource
with just devm_platform_ioremap_resource()

Used Coccinelle to do this change. SmPl patch:
@rule_1@
identifier res;
expression ioremap_res;
identifier pdev;
@@
-struct resource *res;
...
-res = platform_get_resource(pdev,...);
-ioremap_res = devm_ioremap_resource(...);
+ioremap_res = devm_platform_ioremap_resource(pdev,0);

Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Acked-by: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: Anusha Srivatsa <asrivats@redhat.com>
Link: https://lore.kernel.org/r/20250225-memory-drm-misc-next-v1-10-9d0e8761107a@redhat.com
Signed-off-by: Maxime Ripard <mripard@kernel.org>

Author: anushasrivats

drivers/gpu/drm/tiny/arcpgu.c

@@ -253,7 +253,6 @@ static int arcpgu_load(struct arcpgu_drm_private *arcpgu)
 	struct device_node *encoder_node = NULL, *endpoint_node = NULL;
 	struct drm_connector *connector = NULL;
 	struct drm_device *drm = &arcpgu->drm;
-	struct resource *res;
 	int ret;
 
 	arcpgu->clk = devm_clk_get(drm->dev, "pxlclk");
@@ -270,8 +269,7 @@ static int arcpgu_load(struct arcpgu_drm_private *arcpgu)
 	drm->mode_config.max_height = 1080;
 	drm->mode_config.funcs = &arcpgu_drm_modecfg_funcs;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	arcpgu->regs = devm_ioremap_resource(&pdev->dev, res);
+	arcpgu->regs = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(arcpgu->regs))
 		return PTR_ERR(arcpgu->regs);