Remove MBEDTLS_ECDSA_SIGN_ALT

Signed-off-by: Thomas Daubney <thomas.daubney@arm.com>
diff --git a/include/mbedtls/check_config.h b/include/mbedtls/check_config.h
index f8197e4..561432e 100644
--- a/include/mbedtls/check_config.h
+++ b/include/mbedtls/check_config.h
@@ -184,9 +184,7 @@
 #error "MBEDTLS_ECJPAKE_C defined, but not all prerequisites"
 #endif
 
-#if defined(MBEDTLS_ECP_RESTARTABLE)           && \
-    ( defined(MBEDTLS_ECDSA_SIGN_ALT)          || \
-      defined(MBEDTLS_ECDSA_GENKEY_ALT) )
+#if defined(MBEDTLS_ECP_RESTARTABLE) && defined(MBEDTLS_ECDSA_GENKEY_ALT)
 #error "MBEDTLS_ECP_RESTARTABLE defined, but it cannot coexist with an alternative ECP implementation"
 #endif
 
diff --git a/include/mbedtls/mbedtls_config.h b/include/mbedtls/mbedtls_config.h
index dd047e9..b244111 100644
--- a/include/mbedtls/mbedtls_config.h
+++ b/include/mbedtls/mbedtls_config.h
@@ -350,7 +350,6 @@
  */
 //#define MBEDTLS_TIMING_ALT
 
-//#define MBEDTLS_ECDSA_SIGN_ALT
 //#define MBEDTLS_ECDSA_GENKEY_ALT
 
 /**