DO-NOT-MERGE: Use migration branch for aws-ami

Change-Id: I61aeedcce132d828ed3e104bbdcb3f3a8bc7e29c
Signed-off-by: Saheer Babu <saheer.babu@arm.com>
diff --git a/build-aws-amis.yaml b/build-aws-amis.yaml
index 042c0db..7f1c005 100644
--- a/build-aws-amis.yaml
+++ b/build-aws-amis.yaml
@@ -48,7 +48,7 @@
             [ -z "${AMI}" ] && echo "Build Nothing.." && exit
 
             [ -d "aws-amis" ] && rm -rf aws-amis
-            git clone https://git.trustedfirmware.org/ci/aws-amis.git
+            git clone https://git.trustedfirmware.org/ci/aws-amis.git -b openci-migration
             cd aws-amis
 
             for os in ${AMI}