RSA: use constant-time modinv in deduce_crt()

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
diff --git a/library/rsa_alt_helpers.c b/library/rsa_alt_helpers.c
index feb7874..d91949a 100644
--- a/library/rsa_alt_helpers.c
+++ b/library/rsa_alt_helpers.c
@@ -245,7 +245,7 @@
 
     /* QP = Q^{-1} mod P */
     if (QP != NULL) {
-        MBEDTLS_MPI_CHK(mbedtls_mpi_inv_mod(QP, Q, P));
+        MBEDTLS_MPI_CHK(mbedtls_mpi_inv_mod_odd(QP, Q, P));
     }
 
 cleanup: