octeontx2-af: npc: cn20k: Allocate default MCAM indexes

octeontx2-af: npc: cn20k: Allocate default MCAM indexes

Reserving MCAM entries in the AF driver for installing default MCAM
entries is not an efficient allocation method, as it results in
significant wastage of entries. This patch allocates MCAM indexes for
promiscuous, multicast, broadcast, and unicast traffic in descending
order of indexes (from lower to higher priority) when the NIX LF is
attached to the PF/VF.

Signed-off-by: Ratheesh Kannoth <rkannoth@marvell.com>
Link: https://patch.msgid.link/20260224080009.4147301-6-rkannoth@marvell.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>