Resolve StatusHints image exploit across user.

Because of the INTERACT_ACROSS_USERS permission, an app that implements
a ConnectionService can upload an image icon belonging to another user
by setting it in the StatusHints. Validating the construction of the
StatusHints on the calling user would prevent a malicious app from
registering a connection service with the embedded image icon from a
different user.

From additional feedback, this CL also addresses potential
vulnerabilities in an app being able to directly invoke the binder for a
means to manipulate the contents of the bundle that are passed with it.
The targeted points of entry are in ConnectionServiceWrapper for the
following APIs: handleCreateConnectionComplete, setStatusHints,
addConferenceCall, and addExistingConnection.

Fixes: 280797684
Test: Manual (verified that original exploit is no longer an issue).
Test: Unit test for validating image in StatusHints constructor.
Test: Unit tests to address vulnerabilities via the binder.
Change-Id: Ie1f6a8866d31d5f1099dd0630cf8e9ee782d389c
Merged-In: Ie1f6a8866d31d5f1099dd0630cf8e9ee782d389c