net: dsa: mv88e6xxx: extract device mapping
The Device Mapping register is an indirect table access. Provide helpers to access this table and explicit the checking of the new DSA_RTABLE_NONE routing table value. Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com> Reviewed-by: NAndrew Lunn <andrew@lunn.ch> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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