Calling sysfs_remove_group() to remove sysfs entries
and unregister bl_pdev in pcf50633_remove().
Signed-off-by: NAxel Lin <axel.lin@gmail.com>
Acked-by: NHarald Welte <laforge@gnumonks.org>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>