ble_mesh: A specific fix for compile warning in idf3.3

- Remove the extra #include "bt_common.h" in mesh_timer.c
- Compared with the latest idf, idf3.3 defines BIT(nr) in
  the "soc/soc.h" without the pre-condition "#ifndef BIT",
  which will cause compile warning when using mesh. So we
  include the header file "soc/soc.h" in "mesh_util.h",
  which can bypass the definition of "BIT" in "mesh_util.h"
  when compiling.

components/bt/esp_ble_mesh/mesh_common/include/mesh_util.h

@@ -15,6 +15,7 @@
 #define _BLE_MESH_UTIL_H_
 
 #include <stddef.h>
+#include "soc/soc.h"
 #include "mesh_types.h"
 
 #ifdef __cplusplus

components/bt/esp_ble_mesh/mesh_common/mesh_timer.c

@@ -14,7 +14,6 @@
 
 #include "mesh_common.h"
 #include "provisioner_prov.h"
-#include "bt_common.h"
 
 static hash_map_t *bm_alarm_hash_map;
 static const size_t BLE_MESH_GENERAL_ALARM_HASH_MAP_SIZE = 20 + CONFIG_BLE_MESH_PBA_SAME_TIME + \