Track voice_recognizers being notLowRam

Before, an explicit check for isLowRamDevice in
VoiceInteractionManagerService would override this anyway so omitting
notLowRam had no real efffect. With that check removed, we make
voice_recognizers notLowRam by default like in the parent.

Bug: 117630721
Test: Manual on elfin (notLowRam) and elfin_mini (lowRam)
Change-Id: Ic33c9ae0f03ea61d6ca3354fa7622b733bbc57d0