[PATCH 1/3] fbdev: Fix recursive dependencies wrt BACKLIGHT_CLASS_DEVICE

[kernel test robot]

Hi Thomas,

kernel test robot noticed the following build errors:

[auto build test ERROR on staging/staging-testing]
[also build test ERROR on staging/staging-next staging/staging-linus drm/drm-next drm-exynos/exynos-drm-next linus/master v6.13-rc2 next-20241211]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Thomas-Zimmermann/fbdev-Fix-recursive-dependencies-wrt-BACKLIGHT_CLASS_DEVICE/20241210-222618
base:   staging/staging-testing
patch link:    https://lore.kernel.org/r/20241210142329.660801-2-tzimmermann%40suse.de
patch subject: [PATCH 1/3] fbdev: Fix recursive dependencies wrt BACKLIGHT_CLASS_DEVICE
config: loongarch-defconfig (https://download.01.org/0day-ci/archive/20241211/202412112135.pzFeIjEo-lkp@intel.com/config)
compiler: loongarch64-linux-gcc (GCC) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241211/202412112135.pzFeIjEo-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202412112135.pzFeIjEo-lkp@intel.com/

All errors (new ones prefixed by >>):

   loongarch64-linux-ld: drivers/video/fbdev/aty/radeon_backlight.o: in function `radeonfb_bl_init':
>> radeon_backlight.c:(.text+0x424): undefined reference to `backlight_device_register'
   loongarch64-linux-ld: drivers/video/fbdev/aty/radeon_backlight.o: in function `radeonfb_bl_exit':
>> radeon_backlight.c:(.text+0x560): undefined reference to `backlight_device_unregister'

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