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_curves.c b/library/ecp_curves.c
index 0d5dc50..af649a2 100644
--- a/library/ecp_curves.c
+++ b/library/ecp_curves.c
@@ -4613,7 +4613,7 @@
 #if defined(MBEDTLS_ECP_DP_CURVE448_ENABLED)
 static int ecp_mod_p448(mbedtls_mpi *);
 MBEDTLS_STATIC_TESTABLE
-int mbedtls_ecp_mod_p448(mbedtls_mpi_uint *, size_t);
+int mbedtls_ecp_mod_p448_raw(mbedtls_mpi_uint *, size_t);
 #endif
 #if defined(MBEDTLS_ECP_DP_SECP192K1_ENABLED)
 static int ecp_mod_p192k1(mbedtls_mpi *);
@@ -5499,7 +5499,7 @@
      * will no longer happen. */
     MBEDTLS_MPI_CHK(mbedtls_mpi_grow(N, expected_width));
 
-    ret = mbedtls_ecp_mod_p448(N->p, N->n);
+    ret = mbedtls_ecp_mod_p448_raw(N->p, N->n);
 
 cleanup:
     return ret;
@@ -5517,7 +5517,7 @@
  * since mpi_core_add will then use 64-bit adds.
  */
 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)
 {
     size_t round;
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;