provisioner remove dependency of marco BLE_MESH_CDB

[gavin-yy]

currently the provisioner feature depends on marco BLE_MESH_CDB. This dependency seems not be expected ?
This commit is trying to remove this dependency. Then the shell demo for linux as a mesh provisioner role without BLE_MESH_CDB and BLE_MESH_SETTINGS works.

BTW, BLE_MESH_CDB depends on BLE_MESH_SETTINGS, if BLE_MESH_SETTINGS is not enabled, it cause compiling error.
static void schedule_cdb_store(int flag)
{
atomic_set_bit(bt_mesh_cdb.flags, flag);
bt_mesh_settings_store_schedule(BT_MESH_SETTINGS_CDB_PENDING);
}
nimble/host/mesh/src/cdb.c:545: undefined reference to `bt_mesh_settings_store_schedule'