buildroot

configs/qemu: update arm versatile

Switch to kernel 4.0.
Remove redudant/pointless kernel options to reduce bloat.
Switch from smc9111 to rtl8139 for networking because of issues.
Enable evdev support for better x11 testing.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>