Test: manual testing - ensure that the brightness value in
Settings>Display>Brightness Level can go the full range from 0% to 100%.
[wight554: adapted for our value]
Signed-off-by: Volodymyr Zhdanov <wight554@gmail.com>
Change-Id: Ife1f2796bb3b8ec5f508903afd30a31556b49cbe