ble_mesh: example: Remove some useless included header files

examples/bluetooth/esp_ble_mesh/ble_mesh_node/onoff_client/main/board.c

@@ -9,7 +9,6 @@
 
 #include <stdio.h>
 
-#include "driver/uart.h"
 #include "driver/gpio.h"
 #include "esp_log.h"
 

examples/bluetooth/esp_ble_mesh/ble_mesh_sensor_model/sensor_client/main/board.c

@@ -9,7 +9,6 @@
 
 #include <stdio.h>
 #include "esp_log.h"
-#include "driver/uart.h"
 #include "iot_button.h"
 #include "esp_ble_mesh_sensor_model_api.h"
 

examples/bluetooth/esp_ble_mesh/ble_mesh_vendor_model/vendor_client/main/board.c

@@ -9,7 +9,6 @@
 
 #include <stdio.h>
 #include "esp_log.h"
-#include "driver/uart.h"
 #include "iot_button.h"
 
 #define TAG "BOARD"