ARM: sun5i: dt: Add AT24 device on A10S-OLinuXino-Micro

This OLIMEX board has a AT24C16BN-SH EEPROM holding the MAC address.
This patch adds the corresponding device tree node to reflect this.

Signed-off-by: Emilio López <emilio@elopez.com.ar>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>