Use Bundle for inter-process message

The message sent from NetworkScanRequestTracker to TelephonyScanManager
might be across different process, so we have to wrap the List<CellInfo> into
Bundle because List<> is not parcelable.

Cherry-picked cleanly from:
https://googleplex-android-review.googlesource.com/#/c/2466963/

Test: Telephony sanity tests
Bug: 30954762

Merged-in: I53f935353c392a94cb5caf8a463dc0d8db319db1
Change-Id: I53f935353c392a94cb5caf8a463dc0d8db319db1
(cherry picked from commit f302b769)