ar8216: add link change detection for switch ports

Check for switch port link changes and
- flush ATU in case of a change
- report link change via syslog

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>

SVN-Revision: 44102

target/linux/generic/files/drivers/net/phy/ar8216.h

@@ -396,6 +396,7 @@ struct ar8xxx_priv {
 	bool initialized;
 	bool port4_phy;
 	char buf[2048];
+	bool link_up[AR8X16_MAX_PORTS];
 
 	bool init;