[WIP] device: add lg-hammerhead

[0x4A6F]

Device: LG Google Nexus 5 Codename: lg-hammerhead

• [x] compiles
• [ ] booting
• [ ] firmware

[samueldr]

Hi!

We just had some major~ish changes, at least one affecting new ports. I would heavily suggest rebasing on top of the latest master update.

The main change affecting ports is that we now have required kernel configuration options, which set known good values to a lot of "difficult to guess" options. A simple bin/kernel-normalize-config should be all that is needed.

Hope this helps!

Though uh... This port is a bit old, don't worry if it gets hard to rebase, you could always ping me if you need help going forward, or see also #144.

[samueldr]

(Not closing with #643 since this is actually mainline-based, if I understand it right.)