Allow setting Hotword mode for capture usecases that want to use the low
power DSP based hotword source for capturing audio. This will be only
available for AudioSource.VOICE_RECOGNITION. There is no guarantee that
this mode will be available on the device. The caller must have the
CAPTURE_AUDIO_HOTWORD permission granted.
Bug 178317696
Test: Able to setHotwordMode from AGSA application. Confirmed
HAL receives the flag and audioSource correctly in open_input_stream.
Merged-In: I1fb80a047654e2abb8a587bf2f6ff82fcacd67b6
Change-Id: I1fb80a047654e2abb8a587bf2f6ff82fcacd67b6
(cherry picked from commit 25c32fbd9e)