backlight: Nuke BL_CORE_DRIVER1

Now that the 3 drivers using this are cleaned up we can also remove
this final bit of confusion of leaking driver internals into the
backlight power interface.

The backlight power interface itself is still a massive mess.
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

include/linux/backlight.h

@@ -84,7 +84,6 @@ struct backlight_properties {
 
 #define BL_CORE_SUSPENDED	(1 << 0)	/* backlight is suspended */
 #define BL_CORE_FBBLANK		(1 << 1)	/* backlight is under an fb blank event */
-#define BL_CORE_DRIVER1		(1 << 31)	/* reserved for driver specific use */
 
 };