drm/hisilicon: Adding a const declaration to an invariant construct

Some constructs cannot be changed after being assigned a value,
so add const declarations to invariant constructs.
Signed-off-by: Tian Tao <tiantao6@hisilicon.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/1603955505-43942-1-git-send-email-tiantao6@hisilicon.com

drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c

@@ -139,7 +139,7 @@ static const u32 channel_formats1[] = {
 	DRM_FORMAT_ABGR8888
 };
 
-static struct drm_plane_funcs hibmc_plane_funcs = {
+static const struct drm_plane_funcs hibmc_plane_funcs = {
 	.update_plane	= drm_atomic_helper_update_plane,
 	.disable_plane	= drm_atomic_helper_disable_plane,
 	.destroy = drm_plane_cleanup,

drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c

@@ -369,7 +369,7 @@ static void hibmc_pci_remove(struct pci_dev *pdev)
 	drm_dev_put(dev);
 }
 
-static struct pci_device_id hibmc_pci_table[] = {
+static const struct pci_device_id hibmc_pci_table[] = {
 	{ PCI_VDEVICE(HUAWEI, 0x1711) },
 	{0,}
 };