net: marvell: prestera: define and implement MDB / flood domain API for...

net: marvell: prestera: define and implement MDB / flood domain API for entries creation and deletion

Define and implement prestera API calls for managing MDB and
  flood domain (ports) entries (create / delete / find calls).

Co-developed-by: Yevhen Orlov <yevhen.orlov@plvision.eu>
Signed-off-by: Yevhen Orlov <yevhen.orlov@plvision.eu>
Signed-off-by: Oleksandr Mazur <oleksandr.mazur@plvision.eu>
Signed-off-by: David S. Miller <davem@davemloft.net>