Revert "net: dsa: stop updating master MTU from master.c"

Revert "net: dsa: stop updating master MTU from master.c"

This reverts commit a1ff94c2973c43bc1e2677ac63ebb15b1d1ff846.

Switch drivers that don't implement ->port_change_mtu() will cause the
DSA master to remain with an MTU of 1500, since we've deleted the other
code path. In turn, this causes a regression for those systems, where
MTU-sized traffic can no longer be terminated.

Revert the change taking into account the fact that rtnl_lock() is now
taken top-level from the callers of dsa_master_setup() and
dsa_master_teardown(). Also add a comment in order for it to be
absolutely clear why it is still needed.

Fixes: a1ff94c2973c ("net: dsa: stop updating master MTU from master.c")
Reported-by: Luiz Angelo Daros de Luca <[email protected]>
Signed-off-by: Vladimir Oltean <[email protected]>
Tested-by: Luiz Angelo Daros de Luca <[email protected]>
Signed-off-by: David S. Miller <[email protected]>