tlan: Add ethtool support

Add basic ethtool support to tlan driver:
 - driver info  - link detect (this allows NetworkManager to detect carrier)
 - EEPROM read

Signed-off-by: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/ti/tlan.h b/drivers/net/ethernet/ti/tlan.h
index 4ced905..b6ceeba 100644
--- a/drivers/net/ethernet/ti/tlan.h
+++ b/drivers/net/ethernet/ti/tlan.h
@@ -240,6 +240,7 @@
 #define TLAN_EEPROM_ACK		0
 #define TLAN_EEPROM_STOP	1
 
+#define TLAN_EEPROM_SIZE	256