[BEKEN] change the return type of InitClock_RealTime() and update some

comments.

src/platform/Beken/SystemTimeSupport.cpp

@@ -20,7 +20,7 @@
 /**
  *    @file
  *          Provides implementations of the CHIP System Layer platform
- *          time/clock functions that are suitable for use on the Ameba platform.
+ *          time/clock functions that are suitable for use on the Beken platform.
  */
 /* this file behaves like a config.h, comes first */
 #include <platform/internal/CHIPDeviceLayerInternal.h>
@@ -73,7 +73,12 @@ CHIP_ERROR InitClock_RealTime()
     baseTime =
         Clock::Milliseconds64((static_cast<uint64_t>(CHIP_SYSTEM_CONFIG_VALID_REAL_TIME_THRESHOLD) * kMicrosecondsPerMillisecond));
 
-    return CHIP_NO_ERROR;
+    // Use CHIP_SYSTEM_CONFIG_VALID_REAL_TIME_THRESHOLD as the initial value of RealTime.
+    // Then the RealTime obtained from GetClock_RealTime will be always valid.
+    //
+    // TODO(19081): This is broken because it causes the platform to report
+    //              that it does have wall clock time when it actually doesn't.
+    return System::SystemClock().SetClock_RealTime(baseTime);
 }
 
 } // namespace Clock

src/platform/Beken/matter_pal.h

@@ -1,13 +1,23 @@
-/**
- ****************************************************************************************
+/*
+ *
+ *    Copyright (c) 2022 Project CHIP Authors
  *
- * @file matter_pal.h
+ *    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
  *
- * @brief This file contains matter_pal.
- * @author zhengyaohan
- * @date 2022-03-29
+ *        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.
+ */
+
+/**
+ *    @file
+ *          This file contains matter_pal.
  */
 
 #ifndef _MATTER_PAL_H_
@@ -34,5 +44,5 @@
 #include "at_ble_common.h"
 #include "ble.h"
 
-#endif // _HOMEKIT_PAL_H_
+#endif // _MATTER_PAL_H_
 // eof