drm/radeon: Use pci_get_base_class() to reduce duplicated code

Use pci_get_base_class() to reduce duplicated code.  No functional change
intended.

Link: https://lore.kernel.org/r/20230825062714.6325-6-sui.jingfeng@linux.devSigned-off-by: Sui Jingfeng <suijingfeng@loongson.cn>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/radeon_bios.c

@@ -199,20 +199,11 @@ static bool radeon_atrm_get_bios(struct radeon_device *rdev)
 	if (rdev->flags & RADEON_IS_IGP)
 		return false;
 
-	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
-		dhandle = ACPI_HANDLE(&pdev->dev);
-		if (!dhandle)
+	while ((pdev = pci_get_base_class(PCI_BASE_CLASS_DISPLAY, pdev))) {
+		if ((pdev->class != PCI_CLASS_DISPLAY_VGA << 8) &&
+		    (pdev->class != PCI_CLASS_DISPLAY_OTHER << 8))
 			continue;
 
-		status = acpi_get_handle(dhandle, "ATRM", &atrm_handle);
-		if (ACPI_SUCCESS(status)) {
-			found = true;
-			break;
-		}
-	}
-
-	if (!found) {
-		while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {
 		dhandle = ACPI_HANDLE(&pdev->dev);
 		if (!dhandle)
 			continue;
@@ -223,7 +214,6 @@ static bool radeon_atrm_get_bios(struct radeon_device *rdev)
 			break;
 		}
 	}
-	}
 
 	if (!found)
 		return false;