tls: fix guards for ECDSA support

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/library/ssl_misc.h b/library/ssl_misc.h
index 3012b1d..f4ae20e 100644
--- a/library/ssl_misc.h
+++ b/library/ssl_misc.h
@@ -783,7 +783,7 @@
 #endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
 
 #if defined(MBEDTLS_KEY_EXCHANGE_SOME_ECDH_OR_ECDHE_ANY_ENABLED) || \
-    defined(MBEDTLS_KEY_EXCHANGE_WITH_ECDSA_ANY_ENABLED) || \
+    defined(MBEDTLS_KEY_EXCHANGE_ECDSA_CERT_REQ_ANY_ALLOWED_ENABLED) || \
     defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
     uint16_t *curves_tls_id;      /*!<  List of TLS IDs of supported elliptic curves */
 #endif
@@ -2482,7 +2482,7 @@
             break;
 #endif
 
-#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
+#if defined(MBEDTLS_KEY_EXCHANGE_ECDSA_CERT_REQ_ALLOWED_ENABLED)
         case MBEDTLS_SSL_SIG_ECDSA:
             break;
 #endif