Add ContentValues & CursorWindow to framework.aidl

By adding these stubs, they will be automatically added to framework.aidl
in sdk builds.

This makes it easier for unbundled apps to pass these objects across
AIDL calls.

ContentValues & CursorWindow are already public Parcelables. It is an
oversight that they were not already in framework.aidl.

There are a lot of other public Parcelables that are missing from
framework.aidl. This just fixes two commonly requested ones.

Change-Id: If61e19b1206da1680413d9ea03de87a90b6d233e