staging: iio: light remove empty light.h file

We can put this back when there is something to put in it!
Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/iio/light/light.h

-#include "../sysfs.h"
-
-/* Light to digital sensor attributes */
-
-