Merge branch 'm7530-sw-fallback'

DENG Qingfang says:

====================
mt7530 software fallback bridging fix

DSA core has gained software fallback support since commit 2f5dc00f,
but it does not work properly on mt7530. This patch series fixes the
issues.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>