Register a device newly added pcf50633-backlight driver as a child device in
the pcf50633 core driver.
Signed-off-by: NLars-Peter Clausen <lars@metafoo.de>
Acked-by: NSamuel Ortiz <sameo@linux.intel.com>
Signed-off-by: NRichard Purdie <rpurdie@linux.intel.com>