The reference to telephony registry service was assigned
prior telephony registry service was ready. Fixed by
casting the binder every time when we use it.
Test: Manual
Bug: 65593241
Merged-In: Ib234cdfd93130f7af44ef79271b106fffb8ebad5
Change-Id: Ib234cdfd93130f7af44ef79271b106fffb8ebad5
(cherry picked from commit 66420e258a)