rocker: implement ndo_fdb_dump

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
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v3->v4:
-ndm->ndm_flags set to NTF_SELF as pointed out by Scott
-use err to store retval of rocker_fdb_fill_info and break only in case < 0
new in v3
rocker: add ndo_bridge_setlink/getlink support for learning policy

Rocker ports will use new "swdev" hwmode for bridge port offload policy.
Current supported policy settings are BR_LEARNING and BR_LEARNING_SYNC.
User can turn on/off device port FDB learning and syncing to bridge.

Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Signed-off-by: Jiri Pirko <jiri@resnulli.us>
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new in v3