drivers/net/vsc9953: Add commands to enable/disable HW learning

The command:
ethsw [port <port_no>] learning { [help] | show | auto | disable }

can be used to enable/disable HW learning on a port.
This patch also adds this command to the generic ethsw parser from
cmd_ethsw.

Signed-off-by: Johnson Leung <johnson.leung@freescale.com>
Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@freescale.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: York Sun <yorksun@freescale.com>
diff --git a/include/ethsw.h b/include/ethsw.h
index 8f1c414..6d2f0de 100644
--- a/include/ethsw.h
+++ b/include/ethsw.h
@@ -22,6 +22,8 @@
 	ethsw_id_disable,
 	ethsw_id_statistics,
 	ethsw_id_clear,
+	ethsw_id_learning,
+	ethsw_id_auto,
 	ethsw_id_count,	/* keep last */
 };
 
@@ -45,6 +47,8 @@
 	int (*port_show)(struct ethsw_command_def *parsed_cmd);
 	int (*port_stats)(struct ethsw_command_def *parsed_cmd);
 	int (*port_stats_clear)(struct ethsw_command_def *parsed_cmd);
+	int (*port_learn)(struct ethsw_command_def *parsed_cmd);
+	int (*port_learn_show)(struct ethsw_command_def *parsed_cmd);
 };
 
 int ethsw_define_functions(const struct ethsw_command_func *cmd_func);