Remove MBEDTLS_RIPEMD160_PROCESS_ALT

Signed-off-by: Thomas Daubney <thomas.daubney@arm.com>
diff --git a/include/mbedtls/mbedtls_config.h b/include/mbedtls/mbedtls_config.h
index a256c36..28f0a00 100644
--- a/include/mbedtls/mbedtls_config.h
+++ b/include/mbedtls/mbedtls_config.h
@@ -387,7 +387,6 @@
  *            implementation should be provided for mbedtls_ecdsa_sign_det_ext().
  *
  */
-//#define MBEDTLS_RIPEMD160_PROCESS_ALT
 //#define MBEDTLS_SHA1_PROCESS_ALT
 //#define MBEDTLS_SHA256_PROCESS_ALT
 //#define MBEDTLS_SHA512_PROCESS_ALT
diff --git a/tf-psa-crypto/drivers/builtin/src/ripemd160.c b/tf-psa-crypto/drivers/builtin/src/ripemd160.c
index 96b5466..835df95 100644
--- a/tf-psa-crypto/drivers/builtin/src/ripemd160.c
+++ b/tf-psa-crypto/drivers/builtin/src/ripemd160.c
@@ -59,8 +59,6 @@
 
     return 0;
 }
-
-#if !defined(MBEDTLS_RIPEMD160_PROCESS_ALT)
 /*
  * Process one block
  */
@@ -256,8 +254,6 @@
     return 0;
 }
 
-#endif /* !MBEDTLS_RIPEMD160_PROCESS_ALT */
-
 /*
  * RIPEMD-160 process buffer
  */