kas/corstone1000: Use BitBake and OE Core instead of Poky

As the Poky layer will no longer be updated following
the integration of `bitbake-setup`, developers are advised to
use a combination of the `bitbake` and `openembedded-core`
layers instead of the `poky` layer.

Note that the `poky` layer is a combination of these two
layers glued into a single repository for convenience.

Signed-off-by: Hugues KAMBA MPIANA <hugues.kambampiana@arm.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>

kas/corstone1000-base.yml

@@ -8,19 +8,27 @@ defaults:
     branch: master
 
 repos:
+  bitbake:
+    url: https://git.openembedded.org/bitbake
+    layers:
+      bitbake: disabled
+
+  core:
+    url: https://git.openembedded.org/openembedded-core
+    layers:
+      meta:
+
+  meta-yocto:
+    url: https://git.yoctoproject.org/meta-yocto
+    layers:
+      meta-poky:
+
   meta-arm:
     layers:
       meta-arm:
       meta-arm-bsp:
       meta-arm-toolchain:
 
-  poky:
-    url: https://git.yoctoproject.org/git/poky
-    # commit: 5465094be9a61a1639e1dab6d2b4ebea2bee7440
-    layers:
-      meta:
-      meta-poky:
-
   meta-openembedded:
     url: https://git.openembedded.org/meta-openembedded
     # commit: 461d85a1831318747af5abe86da193bcde3fd9b4