ieee802154: ca8210: Flag the driver as being limited

ieee802154: ca8210: Flag the driver as being limited

This is a hardMAC device wired to Linux 802154 softMAC
implementation. It is a bit limited in the sense that it cannot handle
anything else that datagrams. Let's flag it like this to prevent using
unsupported features such as scan/beacons handling.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20230324110558.90707-3-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>