Merge branch 'reduce-coupling-between-dsa-and-broadcom-systemport-driver'

Vladimir Oltean says:

====================
Reduce coupling between DSA and Broadcom SYSTEMPORT driver

Upon a quick inspection, it seems that there is some code in the generic
DSA layer that is somehow specific to the Broadcom SYSTEMPORT driver.
The challenge there is that the hardware integration is very tight between
the switch and the DSA master interface. However this does not mean that
the drivers must also be as integrated as the hardware is. We can avoid
creating a DSA notifier just for the Broadcom SYSTEMPORT, and we can
move some Broadcom-specific queue mapping helpers outside of the common
include/net/dsa.h.
====================

Link: https://lore.kernel.org/r/20210107012403.1521114-1-olteanv@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>