intel_panel.c:undefined reference to `backlight_device_register'

[kernel test robot <lkp@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   d7a5aa4b3c007fae50405ca75c40258d90300e96
commit: 8c5dc8d9f19c7992b5ed557b865127a80149041b video: backlight: Remove useless BACKLIGHT_LCD_SUPPORT kernel symbol
date:   5 years ago
config: x86_64-buildonly-randconfig-002-20240816 (https://download.01.org/0day-ci/archive/20240816/202408161408.9pyW8nFp-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240816/202408161408.9pyW8nFp-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202408161408.9pyW8nFp-lkp@intel.com/

All errors (new ones prefixed by >>):

   ld: warning: arch/x86/lib/csum-copy_64.o: missing .note.GNU-stack section implies executable stack
   ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker
   ld: warning: arch/x86/lib/csum-copy_64.o: missing .note.GNU-stack section implies executable stack
   ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker
   ld: warning: .tmp_vmlinux1 has a LOAD segment with RWX permissions
   ld: drivers/gpu/drm/i915/intel_panel.o: in function `intel_backlight_device_register':
>> intel_panel.c:(.text+0x4e08): undefined reference to `backlight_device_register'
   ld: drivers/gpu/drm/i915/intel_panel.o: in function `intel_backlight_device_unregister':
>> intel_panel.c:(.text+0x4ea6): undefined reference to `backlight_device_unregister'

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