Merge "fs_mgr: change the log level in fs_mgr_read_fstab_dt()"

{

    std::string fstab_buf = read_fstab_from_dt();

    if (fstab_buf.empty()) {

        LERROR << __FUNCTION__ << "(): failed to read fstab from dt";

        LINFO << __FUNCTION__ << "(): failed to read fstab from dt";

        return nullptr;

    }