Add new RIL commands and generic code cleanups.
The only changes required for OMA DM support are the
addition of five new methods in ITelephony.aidl for
reading/writing NV items and performing NV config and
radio resets (requires MODIFY_PHONE_STATE), along with
the new RIL request IDs in RILConstants.java.
Bug: 12864208
Change-Id: I958d2571580d98a49936ef2e6822e5ac086acbe2