dpaa2-switch: trap STP frames to the CPU

Add an ACL entry in each port's ACL table to redirect any frame that
has the destination MAC address equal to the STP dmac to the control
interface.

Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>