dpll: add client-side filtering for device show

Add client-side filtering support for dpll device show command.
Users can filter devices by module-name, clock-id, type, mode,
and lock-status. Multiple filters use AND semantics. Filters
work with both dump (all devices) and single GET (by id) operations.

Signed-off-by: Petr Oros <poros@redhat.com>
Signed-off-by: David Ahern <dsahern@kernel.org>