samsung-i927: new device (Samsung Captive Glide) (!195)

Runs an only slightly patched mainline kernel.

For now:
- flashing works (only SD card boot and kernel flashing tested)
- boots
- screen works
- keyboard works
- touch works
- accelerated Xorg works (OGL not tested, xf86-video-tegra works,
  but sometims X crashes with invalid instruction error - open top menus in
  Xfce file manager to reproduce)
- SD card works (troubles with GPIO insertion detection)
- USB should work, not tested
- WiFi should work, also not tested (a lot of warnings during boot)
- Sound needs configuration
- battery needs kernel driver (max8922/max8907c)
- touchkey doesn't work - very strange hardware here...
- cameras don't work - no DT bindings, but all drivers there

Other functionality is broken/not tested.

[skip ci]: already built successfully in CI