Allow BAL for HeavyWeightSwitcher.

The switcher dialog is started by the system and need to be able to
bring the chosen activity back to the foreground.

Test: CtsAppTestCases:android.app.cts.ActivityManagerProcessStateTest#testCantSaveStateLaunchAndSwitch
Bug: 277600629
Change-Id: Iddd9daed932fb4469492c895a041895a7f2cb416
1 file changed