Made HIDE_NON_SYSTEM_OVERLAY_WINDOWS permission available to pre-installed apps

Allowing pre-installed apps to use HIDE_NON_SYSTEM_OVERLAY_WINDOWS
permission which can prevent other app's overlay displaying on top
of its activity.

Also fixed the CTS failure broken by ag/11571323.

Bug: 144507081
Bug: 156196966

Test: Manual & CtsPermission2TestCases
Change-Id: I0262d8613f2407f20c935d5801b4d76f4ea5f5c2
1 file changed