MSIM: Add support for Manage SIM Contacts for MultiSim.

1. Make changes to inform modules who are observing changes in
Content Resolver for ADN.
2. Add null pointer checks in normalizeValue and while parsing PBR
to avoid exceptions.

Change-Id: Ifb59bf8fb95defa76e103112c2dba3666f1a0120
(cherry picked from commit 1686c3c37d8b0c69050c320dca2c145bcb30c1ba)
(cherry picked from commit f7e220049373fce81cbb7efadccd5dd0ace409a8)