mlxsw: reg: Add MAC profile ID field to RITR register

Add MAC profile ID field to RITR register so that it could be used for
associating a RIF with a MAC profile ID by a later patch.

Signed-off-by: Danielle Ratson <danieller@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>