sfc: Don't refer to 'stack' in filter implementation

Change all the 'stack' naming to 'auto' (or other meaningful term);
the device address list is based on more than just what the network
stack wants, and the no-match filters aren't really what the stack
wants at all.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>

diff --cc drivers/net/ethernet/sfc/ef10.c
Simple merge

diff --cc drivers/net/ethernet/sfc/farch.c
Simple merge