Adds preliminary patches for 4.19
Known Issues:
- Does not like a lot of HDMI adapters
Needs tested by anyone with a Le Potato, Odroid C2, or Nanopi K2
- merging C2 and Meson family on the source level, C2 is still making own kernels, but sources, patches and configs are the same
- merged boot scripts for meson family. support for non existing legacy kernel was dropped from boot scripts, added UUID support, armbianEnv.txt
- Meson default remain on 4.14.y, NEXT moved to 4.17.y and DEV remains on master
- remove deprecated patches, remove wrong permissions in patches
- tested on C2, K2 and Le Potate. USB troubles are still present and common, while K2 and Lepotato might have boot/reboot troubles on 4.16+
- boards configuration cleanup
- moving K2 to the supported list. It's the same level of support as Le Potato
