ble_mesh: Rename ble mesh example main & init files

- Rename ble_mesh_demo_main.c to main.c
- Rename ble_mesh_demo_init.* to ble_mesh_example_init.*

examples/bluetooth/esp_ble_mesh/common_components/example_init/CMakeLists.txt

@@ -1,3 +1,3 @@
-idf_component_register(SRCS "ble_mesh_demo_init.c"
+idf_component_register(SRCS "ble_mesh_example_init.c"
                     INCLUDE_DIRS  "."
                     REQUIRES bt)

examples/bluetooth/esp_ble_mesh/common_components/example_init/ble_mesh_example_init.c

@@ -26,7 +26,7 @@
 #endif
 
 #include "esp_ble_mesh_defs.h"
-#include "ble_mesh_demo_init.h"
+#include "ble_mesh_example_init.h"
 
 #ifdef CONFIG_BT_BLUEDROID_ENABLED
 void ble_mesh_get_dev_uuid(uint8_t *dev_uuid)

examples/bluetooth/esp_ble_mesh/common_components/example_init/ble_mesh_example_init.h

@@ -6,8 +6,8 @@
    CONDITIONS OF ANY KIND, either express or implied.
 */
 
-#ifndef _BLE_MESH_DEMO_INIT_H_
-#define _BLE_MESH_DEMO_INIT_H_
+#ifndef _BLE_MESH_EXAMPLE_INIT_H_
+#define _BLE_MESH_EXAMPLE_INIT_H_
 
 #include "esp_err.h"
 
@@ -17,4 +17,4 @@ void ble_mesh_get_dev_uuid(uint8_t *dev_uuid);
 
 esp_err_t bluetooth_init(void);
 
-#endif /* _BLE_MESH_DEMO_INIT_H_ */
+#endif /* _BLE_MESH_EXAMPLE_INIT_H_ */