Revert "Added push API and System API client for BackgroundInstallControlService"

core/api/system-current.txt

core/java/android/app/BackgroundInstallControlManager.java

core/java/android/app/OWNERS

core/java/android/app/SystemServiceRegistry.java

...va/android/app/background_install_control_manager.aconfig

.../android/content/pm/IBackgroundInstallControlService.aidl

...oid/server/pm/BackgroundInstallControlCallbackHelper.java

...om/android/server/pm/BackgroundInstallControlService.java

...ests/BackgroundInstallControlServiceTests/host/Android.bp

...BackgroundInstallControlServiceTests/host/AndroidTest.xml

...rver/pm/test/BackgroundInstallControlServiceHostTest.java

...ackgroundInstallControlServiceTestApp/AndroidManifest.xml

...rver/pm/test/app/BackgroundInstallControlServiceTest.java

...stallControlServiceTests/host/test-app/MockApp/Android.bp

...server/pm/BackgroundInstallControlCallbackHelperTest.java

...ndroid/server/pm/BackgroundInstallControlServiceTest.java