Remove bad dependency on MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED for ecdh_ctx guard

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
diff --git a/library/ssl_misc.h b/library/ssl_misc.h
index 659d151..1a81796 100644
--- a/library/ssl_misc.h
+++ b/library/ssl_misc.h
@@ -640,10 +640,9 @@
  * seem correct.
  */
 #if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C)
-#if !defined(MBEDTLS_USE_PSA_CRYPTO) ||                         \
-    defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
+#if !defined(MBEDTLS_USE_PSA_CRYPTO)
     mbedtls_ecdh_context ecdh_ctx;              /*!<  ECDH key exchange       */
-#endif /* !MBEDTLS_USE_PSA_CRYPTO || MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
+#endif /* !MBEDTLS_USE_PSA_CRYPTO */
 
 #if defined(MBEDTLS_USE_PSA_CRYPTO) || defined(MBEDTLS_SSL_PROTO_TLS1_3)
     psa_key_type_t ecdh_psa_type;