octeontx2-af: debugfs: Add channel and channel mask.

This patch is to dispaly channel and channel_mask for each RX
interface of NPC MCAM rule.

Signed-off-by: Rakesh Babu <rsaladi2@marvell.com>
Signed-off-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>