Expose removed permissions flag as system API

There are some permissions that were removed from the platform
and guard nothing but legacy apps may be checking them before
calling APIs. Hence, these apps should get the permissions as
expected despite them being a no-op. To address this the platform
declares removed permissions as normal permissions that are hidden
such that legacy apps can always get them. These permissions are
not shown in the UI. Play needs a way to filter out these
permissions like the platform as they have permissions UI too.

bug:23361760

Change-Id: I10f442dfc09a299ddc5480d8bf2db0bd786aec62