LoongArch: fix ls2k500 bmc not work when installing iso

LoongArch inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I76XQZ

--------------------------------
Signed-off-by: NChong Qiao <qiaochong@loongson.cn>
Signed-off-by: NHongchen Zhang <zhanghongchen@loongson.cn>
(cherry picked from commit 0c4e4596)

drivers/gpu/drm/loongson/lsdc_drv.c

@@ -541,7 +541,7 @@ static int __init lsdc_drm_init(void)
 		 * This integrated video card will always be selected as
 		 * default boot device by vgaarb subsystem.
 		 */
-		if (pdev->vendor != PCI_VENDOR_ID_LOONGSON) {
+		if (pdev->vendor != PCI_VENDOR_ID_LOONGSON || pdev->device == 0x1a05) {
 			pr_info("Discrete graphic card detected, abort\n");
 			return 0;
 		}