rt2800usb: add eFuse EEPROM support

It is needed for at least RT3070 chip.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Acked-by: Ivo van Doorn <IvDoorn@gmail.com>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2800usb.c

@@ -667,7 +667,11 @@ static void rt2800usb_fill_rxdone(struct queue_entry *entry,
  */
 static int rt2800usb_validate_eeprom(struct rt2x00_dev *rt2x00dev)
 {
-	rt2x00usb_eeprom_read(rt2x00dev, rt2x00dev->eeprom, EEPROM_SIZE);
+	if (rt2800_efuse_detect(rt2x00dev))
+		rt2800_read_eeprom_efuse(rt2x00dev);
+	else
+		rt2x00usb_eeprom_read(rt2x00dev, rt2x00dev->eeprom,
+				      EEPROM_SIZE);
 
 	return rt2800_validate_eeprom(rt2x00dev);
 }