Deprecate MANAGE_ACTIVITY_STACKS permission

This is a partial cherry-pick of change:
I894ee66e058b1024a731d3be4b33b69626451f08

The permission is actually not used, but this change aligns the manifest
with contents in downstream branches, so it can be modified (including
removing the permission) without conflicts.

Bug: 157876448
Test: atest FrameworksNetTests
Merged-In: I3c2563d4ae4e3715d0c6270344ba8f7ef067872f
Change-Id: Id50e41a0ea970350eae0a2afab303c022b452bf9
1 file changed