ewaol-config: Use kirkstone branch for layer-dependencies in ewaol-dev config

Issue-Id: SCM-4394
Signed-off-by: Richard Neill <richard.neill@arm.com>
Change-Id: Icc140af9cca0cf91ecfc700ed1b54b4ace5128db

meta-ewaol-config/kas/include/ewaol-dev.yml

@@ -7,13 +7,13 @@ header:
 
 repos:
   meta-arm:
-    refspec: master
+    refspec: kirkstone
 
   meta-openembedded:
-    refspec: master
+    refspec: kirkstone
 
   meta-virtualization:
-    refspec: master
+    refspec: kirkstone
 
   poky:
-    refspec: master
+    refspec: kirkstone