[Ongoing Call] Don't call #getIntent to avoid a security vulnerability.

Fixes: 212467440
Test: atest OngoingCallControllerTest
Test: verified clicking the chip can still open valid activities.
Change-Id: I7707d01be37582461227edcecf5d559f2019c8a5
Merged-In: I7707d01be37582461227edcecf5d559f2019c8a5
(cherry picked from commit 08d94cba)