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/run-build.sh b/run-build.sh
index 9634761..c220fad 100755
--- a/run-build.sh
+++ b/run-build.sh
@@ -13,8 +13,8 @@
 # Expected to have trusted-firmware-m cloned to same level as this git tree
 #
 
-. $(dirname $0)/util_cmake.sh
-. $(dirname $0)/util_git.sh
+. $(dirname $0)/utils/util_cmake.sh
+. $(dirname $0)/utils/util_git.sh
 
 # For dependency that differs from platforms, the versions need to be checkded
 # in each single build job.