Removing dead code from Telephony which uses wakelock.

CallerInfoCache is not actually used anywhere, yet it starts up an async
task to periodically cache direct to voicemail contact information.
This means we're periodically holding a wakelock to lookup this info
even though it is never used.

Test: Build code, manual regression test to make sure basic calling still
works.
Bug: 191049244

Change-Id: I5cd7def15ea481b7d79b3b51d74ec466caa6d8bf
2 files changed