Add support for tc flower mirred action. Two VCAP actions are encoded in
the rule - one for the port mask, and one for the port mask mode. When
the rule is hit, the destination mask is OR'ed with the port mask.

Also add new VCAP function for supporting 72-bit wide actions, and a tc
helper for setting the port forwarding mask.
Signed-off-by: Daniel Machon <daniel.machon@microchip.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>