Remove redundant modifier

Interfaces are abstract by definition so the abstract modifier on the
interface is redundant.
Classes inside of interfaces are public and static by definition, so the
public and static modifiers on the inner classes are redundant.
Fields in interfaces and annotations are automatically public, static and
final, so these modifiers are redundant as well.

Remove redundant modifier and use a common modifier order.

Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>
Reviewed-by: Bastian Germann <bage@linutronix.de>