nfp: flower: remove vlan CFI bit from push vlan action

We no longer set CFI when pushing vlan tags, therefore we remove
the CFI bit from push vlan.

Fixes: 1a1e586f

 ("nfp: add basic action capabilities to flower offloads")
Signed-off-by: Pieter Jansen van Vuuren <pieter.jansenvanvuuren@netronome.com>
Signed-off-by: Louis Peens <louis.peens@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>