kas: Replace poky

Inspired by
 - yocto-builder/entrypoint-build.sh: Replace Poky [1]
 - meta-arm [2]

[1] https://github.com/agherzan/meta-raspberrypi/commit/9806b9981ad2cfed7591d158e5e905aff5f79683
[2] https://git.yoctoproject.org/meta-arm/tree/kas/corstone1000-base.yml

Signed-off-by: Jan Vermaete <jan.vermaete@gmail.com>

kas-poky-rpi.yml

@@ -9,12 +9,25 @@ target:
 repos:
   meta-raspberry:
 
-  poky:
-    url: https://git.yoctoproject.org/git/poky
-    path: layers/poky
+  bitbake:
+    url: https://git.openembedded.org/bitbake
+    path: layers/bitbake
+    branch: master
+    layers:
+      bitbake: disabled
+
+  openembedded-core:
+    url: https://git.openembedded.org/openembedded-core
+    path: layers/openembedded-core
     branch: master
     layers:
       meta:
+
+  meta-yocto:
+    url: https://git.yoctoproject.org/meta-yocto
+    path: layers/meta-yocto
+    branch: master
+    layers:
       meta-poky:
       meta-yocto-bsp: