Merge "Revert "first_stage_mount: Bind mount /system after switch root""

    SwitchRoot("/system");

    // Make /system a mountpoint so that adb-remount can move submounts under /system.

    if (access("/system", F_OK) == 0 &&

        mount("/system", "/system", nullptr, MS_BIND, nullptr) != 0) {

        PLOG(WARNING) << "Failed to bind mount /system for overlayfs";

    }

    return true;

}