mppa: pktio/eth: store min/max rank of non-null masks to avoid iterating on all 8
mppa: pktio/eth: store min/max rank of non-null masks to avoid iterating on all 8

Signed-off-by: Nicolas Morey-Chaisemartin <7188b998d7bb37a035517aa285fa3f5a95344e80@kalray.eu>

kalray/odp-mppa,kalray/odp-mppa,kalray/odp-mppa,kalray/odp-mppa,kalray/odp-mppa,kalray/odp-mppa,kalray/odp-mppa