Split out mbedtls_ecp_mod_p448_raw()

Switch testing over to using the generic raw functions.

Signed-off-by: Paul Elliott <paul.elliott@arm.com>
diff --git a/library/ecp_invasive.h b/library/ecp_invasive.h
index 75714f9..cdc64d6 100644
--- a/library/ecp_invasive.h
+++ b/library/ecp_invasive.h
@@ -284,7 +284,7 @@
  *                  failed.
  */
 MBEDTLS_STATIC_TESTABLE
-int mbedtls_ecp_mod_p448(mbedtls_mpi_uint *X, size_t X_limbs);
+int mbedtls_ecp_mod_p448_raw(mbedtls_mpi_uint *X, size_t X_limbs);
 
 #endif /* MBEDTLS_ECP_DP_CURVE448_ENABLED */