Remove USE_LEGACY_LOCAL_AUDIO_HAL in libsoundtriggerservice

This had been removed from libaudiohal last year in
9e79c70529c07f2157f8077f024f42fa5c9e22f9

Test: treehugger
Change-Id: I8feb2eb88f8f0ba76b3417cf6f724cd6aa55bd0e
4 files changed