Add support to kirkstone (layer is compatible with honister)

[roby2014]

Feature request: Add support to kirkstone

  meta-rauc-community:
    url: "https://github.com/rauc/meta-rauc-community.git"
    branch: master
    path: layers/meta-rauc-community
    layers:
      meta-rauc-tegra:

ERROR: Layer meta-rauc-tegra is not compatible with the core layer which only supports these series: kirkstone (layer is compatible with honister)

I see there is kirkstone branch, but, is it actively updated and dev on?