Don't consider PACKAGE_USAGE_STATS permission.

When we added the new ACCESS_BROADCAST_RESPONSE_STATS
permission, we updated the new broadcast response
related APIs to check both PACKAGE_USAGE_STATS and
ACCESS_BROADCAST_RESPONSE_STATS permissions until clients
are udpated to use the new permission. We can now remove
the logic for checking PACKAGE_USAGE_STATS permission and
only consider ACCESS_BROADCAST_RESPONSE_STATS.

Bug: 225039700
Test: atest tests/tests/app.usage/src/android/app/usage/cts/UsageStatsTest.java
Change-Id: I5b8e8565b936b26463110ce1f0368122c322e632