Postpone location mocking to reduce instrumentation failures

There is a race condition of setting the test provider and issuing
the first update, so postpone the first update to avoid it.

Bug: 315238413
Change-Id: If4d69a708a4bdb0c5c79c161a19c19c260471e27
Test: atest MapsEnterPipTest
Flag: none
1 file changed