mlxsw: spectrum: Introduce flex key blocks for Spectrum-2

Introduce key blocks for Spectrum-2 that contains the same elements used
already for Spectrum1. Along with that, introduce encoder stub.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2 files changed