Improved keychord logging.

Often a bugreport is accidentally triggered by the combo keys, but there
is nothing in the bugreport to confirm that action because init's
klog level is KLOG_NOTICE_LEVEL.

This change change keychord's INFO messages to NOTICE, and also logs the
case where a service was not launched because ADB was disabled.

BUG: 30440213
BUG: 30345559

Change-Id: I6ccadef1621cb41dcd15e7c1660366f0e147dc7a