Fix throtteling logic.

The device time and last acquisition timestamp were not correctly
updated, leading to a miscalculation of the waiting time for the
throttleing logic and tests failures.

Bug: 406965817
Test: android.virtualdevice.cts.camera.VirtualCameraCaptureTest.inputRate_HigherThanMaxFps_allFulfilled
Flag: EXEMPT Bug fix
Change-Id: I16146da27a85526d01f4143e4a186ead5e65e5e9