octeontx2-pf: Add support for exact match table.

NPC exact match table can support more entries than RPM
dmac filters. This requires field size of DMAC filter count
and index to be increased.

Signed-off-by: Ratheesh Kannoth <rkannoth@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>