Improve VTS GNSS 1.1 reliability.

Allow VTS test for low power mode to handle
certain vendor issues that supply one extra location
at the start of low power mode.

Allow more time for GNSS first fix, and warmup as
needed given limited VTS access to AGPS.

Bug: 110626730
Bug: 110987651
Test: (TODO) Passes on device.
Change-Id: Ieeefd7fcd45890b03dffbbee965e1d9b17805c4c