sam460ex: Add RTC device

The Sam460ex has an M41T80 serial RTC chip on I2C bus 0 at address 0x68.
Signed-off-by: NBALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: NCédric Le Goater <clg@kaod.org>
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>

hw/ppc/sam460ex.c

@@ -485,6 +485,7 @@ static void sam460ex_init(MachineState *machine)
     object_property_set_bool(OBJECT(dev), true, "realized", NULL);
     smbus_eeprom_init(i2c[0]->bus, 8, smbus_eeprom_buf, smbus_eeprom_size);
     g_free(smbus_eeprom_buf);
+    i2c_create_slave(i2c[0]->bus, "m41t80", 0x68);
 
     dev = sysbus_create_simple(TYPE_PPC4xx_I2C, 0x4ef600800, uic[0][3]);
     i2c[1] = PPC4xx_I2C(dev);