ospf6d: Fix ospf6 redist with route-map

ospf6d: Fix ospf6 redist with route-map

When ospf6 configure with redistribute connected/protocol
with route-map. Upon restart of frr.service, ospf6 receives
redistribute update then route-map update.
During redistribute route update, since route-map info is not
filled, route is suppressed from injected as external route.

Fix: reset redistribute when route-map update received
matches with redistribution (type) and route-map name.

Ticket:CM-13800
Testing Done:
Configure ospf6 redistribute with route-map to inject
Type-2 external routes into database. Trigger frr restart
redistribute with route-map happens.

Signed-off-by: Chirag Shah <chirag@cumulusnetworks.com>