nokia-argon: Initial Nokia 8110 4G port using close-to-mainline kernel

Keypad, WiFi, Bluetooth, charging and display (using the tinydrm panel-mipi-dbi driver) work. Backlight works now too. LEDs probably have a driver available but I haven't added them to the device tree yet. None of the UIs are really usable since this is a non-touch device with a numeric keypad only. With phosh you can at least unlock and browse apps.

The mainline fork (https://gitlab.com/bananian/msm8909-mainline/tree/6.0) is based on @Minecrell's msm8909 branch and msm8916-mainline. It is not ready for upstreaming, but I'd be happy to create a new mainlining community for this SoC or at least contribute the kernel changes somewhere.

Update: here is a working fork of lk2nd for this device: https://gitlab.com/bananian/lk2nd