net/sfc: move adapter state enum to separate header

Adapter state will be reused by representors, that will have
a separate adapter. Rename adapter state to ethdev state
so that the meaning of it is

net/sfc: move adapter state enum to separate header

Adapter state will be reused by representors, that will have
a separate adapter. Rename adapter state to ethdev state
so that the meaning of it is clearer.

Signed-off-by: Igor Romanov <[email protected]>
Signed-off-by: Andrew Rybchenko <[email protected]>
Reviewed-by: Andy Moreton <[email protected]>
Reviewed-by: Ivan Malov <[email protected]>

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