net: ieee802154: ca8210: Use core return codes instead of hardcoding them

All the error codes defined in this driver are generic and already
defined in the ieee802154 main header. Let's just get rid of these extra
definition and switch to the core's values.

There is no functional change.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20220407100903.1695973-10-miquel.raynal@bootlin.comSigned-off-by: Stefan Schmidt <stefan@datenfreihafen.org>