Use SystemUI reboot UI for factory resets

If available, use SystemUI to present the reboot UI when
rebooting for a factory reset.

Bug: 119920887
Test: Enable config_showSysuiShutdown and trigger factory reset in
      Settings -> Device Preferences -> About -> Factory reset.

Change-Id: Id1efb5a95c69468a92b4295a2f20de2d66140da8