Add generated test for low level subtraction with modulus

Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
diff --git a/tests/Makefile b/tests/Makefile
index 7c08f54..0b31cdd 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -94,6 +94,7 @@
 generated_bignum_test_data: scripts/generate_bignum_tests.py
 generated_bignum_test_data: ../scripts/mbedtls_dev/bignum_common.py
 generated_bignum_test_data: ../scripts/mbedtls_dev/bignum_core.py
+generated_bignum_test_data: ../scripts/mbedtls_dev/bignum_mod_raw.py
 generated_bignum_test_data: ../scripts/mbedtls_dev/test_case.py
 generated_bignum_test_data: ../scripts/mbedtls_dev/test_data_generation.py
 generated_bignum_test_data: