component/esp32 : clear some minor thingsw about PM and coexistence

components/esp32/coexist.c

@@ -0,0 +1,26 @@
+// Copyright 2018-2018 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.
+
+#include "esp_coexist.h"
+#include "coexist_internal.h"
+
+const char *esp_coex_version_get(void)
+{
+    return coex_version_get();
+}
+
+esp_err_t esp_coex_preference_set(esp_coex_prefer_t prefer)
+{
+    return coex_preference_set((coex_prefer_t)prefer);
+}