Remove dependence on sync mode from latency tests

Some latency tests required DeviceConfig syncing to be enabled. This is
fixed using TestableDeviceConfig or enabling/disabling syncs where
necessary. This will allow syncs to be disabled by default during
testing to ensure deterministic platform flags.

Bug: 283536230
Test: atest LatencyTrackerTest FakeLatencyTrackerTest
Test: atest SoundTriggerMiddlewareLoggingLatencyTest w/ --disable-device-config-sync
Change-Id: I312e8b284ccbe0ba0f04b9cff5478a717ca564e4