onclite: init: Define SYS_NICE caps for android.hardware.audio@2.0-service.

- Grant SYS_NICE capabilities to audio HAL processes as sound trigger
HAL threads need to run at real time priority as well as use the
CPU affinity, for far field voice.

CRs-Fixed: 2359951
Change-Id: Ie0da744978609c750e92aec2c6001ace1868ad31