dpaa2-switch: add API for setting up mirroring

Add the necessary MC API for setting up and configuring the mirroring
feature on the DPSW DPAA2 object.

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