kernel: kmod-drm-display-helper: Mark hidden

The Kernel config option CONFIG_DRM_DISPLAY_HELPER has no title and can
not be directly selected. Do the same for this kmod and make it hidden.

Link: https://github.com/openwrt/openwrt/pull/19480
Signed-off-by: Hauke Mehrtens <[email protected]>

package/kernel/linux/modules/video.mk

@@ -321,6 +321,7 @@ define KernelPackage/drm-display-helper
   SUBMENU:=$(VIDEO_MENU)
   TITLE:=DRM helpers for display adapters drivers
   DEPENDS:=@DISPLAY_SUPPORT +kmod-drm-kms-helper
+  HIDDEN:=1
   KCONFIG:=CONFIG_DRM_DISPLAY_HELPER
   FILES:=$(LINUX_DIR)/drivers/gpu/drm/display/drm_display_helper.ko
   AUTOLOAD:=$(call AutoProbe,drm_display_helper)