Filter removedApi file by package

Ensure that when generating stubs for a specific set of packages that
the removedApi file only includes information about the specified
packages.

Bug: 30188076
Test: make update-api

(cherry picked from commit d9e19867a79a315275b6cc897bcdfafdc4b6b218)

Change-Id: Id53c2c21b937dbb25034987825ea824ab286b906
Merged-In: I7f3f20cc202bcd46a1859c10297e5edc95459495
1 file changed