soc: fix register header files not self-contain

components/soc/esp32s2/include/soc/ledc_struct.h

@@ -1,18 +1,12 @@
-// Copyright 2017-2018 Espressif Systems (Shanghai) PTE LTD
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-#ifndef _SOC_LEDC_STRUCT_H_
-#define _SOC_LEDC_STRUCT_H_
+/*
+ * SPDX-FileCopyrightText: 2017-2022 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#pragma once
+
+#include <stdint.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -218,5 +212,3 @@ extern ledc_dev_t LEDC;
 #ifdef __cplusplus
 }
 #endif
-
-#endif  /* _SOC_LEDC_STRUCT_H_ */