mlxsw: spectrum: Change name of mlxsw_sp_afk_blocks to mlxsw_sp1_afk_blocks

This is specific for Spectrum as Spectrum-2 has completely different key
blocks.

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>