Clear caller identify before registering and unregistering phone acct.

Fixes issue with intent being received as expected in legacy use case.

Bug: 37430159
Merged-In: Ibac58ccd0caaad325f4c44b7fe6feda5bb878388
Change-Id: Ibac58ccd0caaad325f4c44b7fe6feda5bb878388
(cherry picked from commit 42064bc7)