BACKPORT: ChromeOS EC patches

[danielstuart14]

Patches backported from upstream, tested and working. Now cros_ec_lpc is being loaded, and so, accelerometer sensors are available to userspace. This should allow iio-sensor-proxy to work (for gnome users), but also make possible to use programs like 2in1screen (https://github.com/aleozlx/2in1screen) that could enable autorotation on xfce.

@reynhout I'd like to draw attention to the kernel version. 4.16 is EOL for almost an year, and so, hasn't got any security patches since then. We should either go back to 4.15 (which is being supported by canonical, since its their LTS kernel), or upgrade to 4.19 (which may break some stuff...)