dpaa2-mac: retrieve API version and detect features

Retrieve the API version running on the firmware and based on it detect
which features are available for usage.
The first one to be listed is the capability to change the MAC protocol
at runtime.

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