mac80211: extract matches_local_if() and refactor into two functions

I would like to use this outside of mesh_hwmp, and in some cases
find the interface given the dest address.

Signed-off-by: Bob Copeland <me@bobcopeland.com>
mac08211: mesh: receive processing for mbss sharing

If a destination interface is participating in a shared mbss, then
we want to receive data frames on the correct interface (or all
for mcast) when passing frames to upper layers.

Signed-off-by: Bob Copeland <me@bobcopeland.com>