octeontx2-af: Convert mbox msg id check to a macro

With 10's of mailbox messages expected to be handled in future,
checking for message id could become a lengthy switch case. Hence
added a macro to auto generate the switch case for each msg id.

Signed-off-by: Aleksey Makarov <amakarov@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>