We are expanding PackageManager's supported attributes and this change
enables the developer to define them in the .bp file.
Test: m nothing
Bug: 191978330
Change-Id: I01d579190fb585662086a7fc456f3b33cb89fb57
Merged-In: I01d579190fb585662086a7fc456f3b33cb89fb57
(cherry picked from commit 826863c8e0)