drm/lsdc: Request PCI BAR

lsdc currently just ioremaps its PCI BAR with pcim_iomap(). Performing
a region regquest additionally can make the driver more robust.

Replace pcim_iomap() with the managed function pcim_iomap_region() which
performs the request and ioremaps the BAR.

Signed-off-by: Philipp Stanner <pstanner@redhat.com>
Reviewed-by: Sui Jingfeng <sui.jingfeng@linux.dev>
Signed-off-by: Sui Jingfeng <sui.jingfeng@linux.dev>
Link: https://patchwork.freedesktop.org/patch/msgid/20241021091116.14368-1-pstanner@redhat.com

drivers/gpu/drm/loongson/lsdc_drv.c

@@ -232,9 +232,9 @@ lsdc_create_device(struct pci_dev *pdev,
 	lsdc_gem_init(ddev);
 
 	/* Bar 0 of the DC device contains the MMIO register's base address */
-	ldev->reg_base = pcim_iomap(pdev, 0, 0);
-	if (!ldev->reg_base)
-		return ERR_PTR(-ENODEV);
+	ldev->reg_base = pcim_iomap_region(pdev, 0, "lsdc");
+	if (IS_ERR(ldev->reg_base))
+		return ldev->reg_base;
 
 	spin_lock_init(&ldev->reglock);