mlxsw: spectrum: Publish mlxsw_sp_ethtype_to_sver_type()

Declare mlxsw_sp_ethtype_to_sver_type() in spectrum.h to enable using it
in other files.

It will be used in the next patch to map between EtherType and the
relevant value configured by SVER register.
Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/spectrum.c

@@ -384,7 +384,7 @@ int mlxsw_sp_port_vid_learning_set(struct mlxsw_sp_port *mlxsw_sp_port, u16 vid,
 	return err;
 }
 
-static int mlxsw_sp_ethtype_to_sver_type(u16 ethtype, u8 *p_sver_type)
+int mlxsw_sp_ethtype_to_sver_type(u16 ethtype, u8 *p_sver_type)
 {
 	switch (ethtype) {
 	case ETH_P_8021Q:

drivers/net/ethernet/mellanox/mlxsw/spectrum.h

@@ -584,6 +584,7 @@ int mlxsw_sp_port_vid_stp_set(struct mlxsw_sp_port *mlxsw_sp_port, u16 vid,
 int mlxsw_sp_port_vp_mode_set(struct mlxsw_sp_port *mlxsw_sp_port, bool enable);
 int mlxsw_sp_port_vid_learning_set(struct mlxsw_sp_port *mlxsw_sp_port, u16 vid,
 				   bool learn_enable);
+int mlxsw_sp_ethtype_to_sver_type(u16 ethtype, u8 *p_sver_type);
 int mlxsw_sp_port_pvid_set(struct mlxsw_sp_port *mlxsw_sp_port, u16 vid,
 			   u16 ethtype);
 struct mlxsw_sp_port_vlan *