Fix naming: FFDH key -> DH key and fix guard in psa_validate_key_type_and_size_for_key_generation

Signed-off-by: Przemek Stekiel <przemyslaw.stekiel@mobica.com>
diff --git a/include/psa/crypto_config.h b/include/psa/crypto_config.h
index 1c4fb6d..3dff049 100644
--- a/include/psa/crypto_config.h
+++ b/include/psa/crypto_config.h
@@ -126,8 +126,8 @@
 #define PSA_WANT_KEY_TYPE_DES                   1
 #define PSA_WANT_KEY_TYPE_ECC_KEY_PAIR          1
 #define PSA_WANT_KEY_TYPE_ECC_PUBLIC_KEY        1
-#define PSA_WANT_KEY_TYPE_FFDH_KEY_PAIR         1
-#define PSA_WANT_KEY_TYPE_FFDH_PUBLIC_KEY       1
+#define PSA_WANT_KEY_TYPE_DH_KEY_PAIR         1
+#define PSA_WANT_KEY_TYPE_DH_PUBLIC_KEY       1
 #define PSA_WANT_KEY_TYPE_RAW_DATA              1
 #define PSA_WANT_KEY_TYPE_RSA_KEY_PAIR          1
 #define PSA_WANT_KEY_TYPE_RSA_PUBLIC_KEY        1