net: mvpp2x: fix BM configuration overrun issue

Issue:
BM counters were overrun by probe that called per Network interface and
caused release of wrong number of buffers during remove procedure.

Fix:
Use probe_done and num_ports to call init and remove procedure
once per communication controller.

Signed-off-by: Stefan Chulski <stefanc@marvell.com>
Tested-by: iSoC Platform CI <ykjenk@marvell.com>
Reviewed-by: Igal Liberman <igall@marvell.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
Signed-off-by: Stefan Roese <sr@denx.de>