mlxsw: spectrum_acl: Make mlxsw_sp_acl_tcam_vregion_rehash() return void

The return value is ignored anyway, so just return void.

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>