ecdhe: fix guards for accelerated ECDHE key exchanges

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/include/mbedtls/check_config.h b/include/mbedtls/check_config.h
index 0d7ea14..1293f43 100644
--- a/include/mbedtls/check_config.h
+++ b/include/mbedtls/check_config.h
@@ -322,7 +322,7 @@
 #endif
 
 #if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) &&                     \
-    !defined(MBEDTLS_ECDH_C)
+    !defined(MBEDTLS_PK_HAVE_ECDH)
 #error "MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED defined, but not all prerequisites"
 #endif
 
@@ -333,13 +333,13 @@
 #endif
 
 #if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) &&                 \
-    ( !defined(MBEDTLS_ECDH_C) || !defined(MBEDTLS_RSA_C) ||          \
+    ( !defined(MBEDTLS_PK_HAVE_ECDH) || !defined(MBEDTLS_RSA_C) ||          \
       !defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_PKCS1_V15) )
 #error "MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED defined, but not all prerequisites"
 #endif
 
 #if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) &&                \
-    ( !defined(MBEDTLS_ECDH_C) ||                                       \
+    ( !defined(MBEDTLS_PK_HAVE_ECDH) ||                                       \
       !defined(MBEDTLS_PK_HAVE_ECDSA) ||                                \
       !defined(MBEDTLS_X509_CRT_PARSE_C) )
 #error "MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED defined, but not all prerequisites"