Input: atkbd - restore resetting LED state at startup

Fix breakage caused by commit 9605fb48
While the input core indeed takes care of restoring led state and
typematic settings upon resume the driver still need to initialize
them properly when registering a new device

Reported-and-tested-by: Marin Mitov <mitov@issp.bas.bg>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>