Input: ALPS - move {addr,nibble}_command settings into alps_set_defaults()

This allows alps_identify() to override these settings based on the
device characteristics, if it is ever necessary.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Tested-by: Dave Turvene <dturvene@dahetral.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>