u8800: Bump up system partition.

Affects the outputted system.img size.
u8800: Introduce hwmac binary.

hwmac binary is used to load hardware generated MAC address to drivers.
Currently only Wi-Fi is supported.
u8800: Add WIFI.

This works together with the hwmac binary to load the mac address and then
handle it to the kernel driver.
u8800: Disable duplicate init.target.rc import.

The target rc is already imported in init binary.