Fix comment about verison of clang required for 'build_aes_armce'

Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>

tests/scripts/all.sh

@@ -4750,7 +4750,7 @@ component_build_aes_aesce_armcc () {
 }
 
 support_build_aes_armce() {
-    # clang >= 4 is required to build with AES extensions
+    # clang >= 11 is required to build with AES extensions
     ver="$(clang --version|grep version|sed -E 's#.*version ([0-9]+).*#\1#')"
     [ "${ver}" -ge 11 ]
 }