Rename top-level kas/ to ci/

The files in kas/ are not generic Kas files, but instead designed
specifically and solely around the CI system.

Change-Id: I30082392ad2231a4c1c41e54a292595adf81715b
Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>

ci/gem5-arm64.yml

@@ -0,0 +1,21 @@
+header:
+  version: 9
+  includes:
+    - base.yml
+
+repos:
+  meta-arm:
+    layers:
+      meta-gem5:
+
+  meta-openembedded:
+    url: https://git.openembedded.org/meta-openembedded
+    layers:
+      meta-oe:
+
+machine: gem5-arm64
+
+target:
+  - core-image-minimal
+  - perf
+  - gem5-aarch64-native