Merge branch 'dsa-tag-modules'

Andrew Lunn says:

====================
Make DSA tag drivers kernel modules

Historically, DSA tag drivers have been compiled into the kernel as
part of the DSA core. With the growing number of tag drivers, it makes
sense to allow this driver code to be compiled as a module, and loaded
on demand.

v2
--
Move name to end of structure, keeping the hot entries at the beginning.
More tag protocol to end of structure to keep hot members at the beginning.
Fix indent of #endif
Rewrite to move list pointer into a new structure
void functions, since there cannot be errors
Fix fall-through comment
Reorder patch for unused symbols to before tag drivers can be modules
tab/space cleanup
Help text wording
NET_DSA_TAG_BRCM_COMMON and NET_DSA_TAG_KZS_COMMON hidden

v3
--
boilerplate: Move kdoc next to macro
boilerplate: Fix THIS_MODULE indentation
Kconfig: More tabification
Kconfig: Punctuation

v4
--
Cover note {H}istorically
Kconfig: trailer
====================

Tested-by: Vivien Didelot <vivien.didelot@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>