Allowlist active voice interaction session from Low Power Standby

If a voice interaction session is started, then it should be allowed to
use the network & wakelocks unrestricted while it is ongoing, since it
is direct user interaction.

Bug: 190822356
Test: atest LowPowerStandbyControllerTest PowerManagerServiceTest
Test: With reference VIS: adb shell cmd voiceinteraction show
      To verify allowlist/wakelock state: adb shell dumpsys power
Change-Id: I63cd0cf2e97b574ba8fa6c6caa8f046cce2bb821