Enable AT24C with ASPEED in the KConfig because the boards build this
device.
Signed-off-by: Patrick Leis <venture@google.com> Reviewed-by: Hao Wu <wuhaotsh@google.com> Reviewed-by: Andrew Jeffery <andrew@codeconstruct.com.au> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>