octeontx2-af: cn10k: mcs: Add debugfs support

This patch adds debugfs entry to dump MCS secy, sc,
sa, flowid and port stats. This helps in debugging
the packet path and to figure out where exactly packet
was dropped.

Signed-off-by: Geetha sowjanya <gakula@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: Subbaraya Sundeep <sbhatta@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>