Fix PermissionTest30#testRequestBothInSequence on automotive

In GrantPermissionsActivity#sendToSettings(GroupState), if the
settings activity exited with a null result, it will restore
the permission to the state before the settings screen was
opened. (Calling setUserSet() will re-save the permission)

Our AutoAppPermissionFragment was not setting a result for the
activity, so add that.

In addition, our AutoAppPermissionFragment belongs to the legacy
AppPermissionActivity, instead of the more modern
ManagePermissionsActivity. ManagePermissionsActivity will launch
AppPermissionsActivity and then finish, causing the result of
AppPermissionsActivity to be lost. Update ManagePermissionsActivity
to wait for the result of AppPermissionActivity, and then set that
as its own result as well.

Bug: 154947457
Test: make cts; cts-tradefed; run cts -m CtsPermission3TestCases -t android.permission3.cts.PermissionTest30#testRequestBothInSequence
Change-Id: I6ba2acbc76baabc4a3715e118b867444ba2f0e7f