octeontx2-af: Fix depth of cam and mem table.

In current driver, NPC cam and mem table sizes are read from wrong
register offset. This patch fixes the register offset so that correct
values are populated on read.

Fixes: b747923a ("octeontx2-af: Exact match support")
Signed-off-by: Ratheesh Kannoth <rkannoth@marvell.com>
Signed-off-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
Signed-off-by: Sai Krishna <saikrishnag@marvell.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>