net: bridge: add a br_set_state helper function

In preparation for being able to propagate port states to e.g: notifiers
or other kernel parts, do not manipulate the port state directly, but
instead use a helper function which will allow us to do a bit more than
just setting the state.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc net/bridge/br_if.c
Simple merge

diff --cc net/bridge/br_netlink.c
Simple merge

diff --cc net/bridge/br_private.h
Simple merge

diff --cc net/bridge/br_stp.c
Simple merge

diff --cc net/bridge/br_stp_if.c
Simple merge

diff --cc net/bridge/br_stp_timer.c
Simple merge