Rename quiet to quiet.sh

Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
diff --git a/tests/scripts/quiet/cmake b/tests/scripts/quiet/cmake
index 3723473..5863978 100755
--- a/tests/scripts/quiet/cmake
+++ b/tests/scripts/quiet/cmake
@@ -15,4 +15,4 @@
 
 export TOOL="cmake"
 
-exec "$(dirname "$0")/quiet" "$@"
+exec "$(dirname "$0")/quiet.sh" "$@"