Utils: Collect util scripts into "utils" folder

To keep file structure clean, collect utils scripts into "utils" folder.

Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
Change-Id: Ib499786db4052637d69189ee5881ede81bff5b5c
diff --git a/clone.sh b/clone.sh
index e5d0531..b4e2786 100755
--- a/clone.sh
+++ b/clone.sh
@@ -29,7 +29,7 @@
 
 set -ex
 
-. $(dirname $0)/util_git.sh
+. $(dirname $0)/utils/util_git.sh
 
 # Take into consideration non-CI runs where SHARE_FOLDER variable
 # may not be present