Add negative test for aesni only

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index d67b484..9cc2ab1 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -3896,6 +3896,7 @@
     make test programs/test/selftest CC=gcc CFLAGS='-Werror -Wall -Wextra -mpclmul -msse2 -maes'
     # check that we built intrinsics - this should be used by default when supported by the compiler
     ./programs/test/selftest aes | grep "AES note: using AESNI"
+    ./programs/test/selftest aes | grep -v "AES note: built-in implementation."
 }