Whether and when we can switch for example from charging fallback to
developer mode depends on multiple triggers - the order of which might vary
from one device/bootup to another. Using custom state evaluation code at
each possible trigger location easily causes unexpected results like device
staying in fallback charging mode until the cable is re-attached.

Add a state evaluation function and call it from those triggers that
potentially allow exit from the charging fallback mode.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>