aat2870 causes build failure in current upstream

[H. Peter Anvin]

Doing an "allmodconfig" on i386:

drivers/built-in.o: In function `aat2870_bl_remove':
/home/hpa/kernel/git.test/drivers/video/backlight/aat2870_bl.c:217:
undefined reference to `backlight_device_unregister'
drivers/built-in.o: In function `aat2870_bl_probe':
/home/hpa/kernel/git.test/drivers/video/backlight/aat2870_bl.c:159:
undefined reference to `backlight_device_register'
/home/hpa/kernel/git.test/drivers/video/backlight/aat2870_bl.c:201:
undefined reference to `backlight_device_unregister'
make[2]: *** [.tmp_vmlinux1] Error 1
make[1]: *** [sub-make] Error 2
make[1]: Leaving directory `/home/hpa/kernel/git.test'

	-hpa
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