audio HAL: Optimize for Spatial Audio

Add CAP_SYS_NICE.
Allow util_clamp_min for Spatializer Effect worker thread.
Reduce glitches caused by core migration.
Reduce power consumption as Spatializer Effect is DSP compute bound.
This change only affects Spatial Audio Effect processing.

Test: instrumented
Test: adb shell 'uclampset -a -p $(pgrep -of android.hardware.audio.service)'
Test: adb shell cat "/proc/$(adb shell pgrep -of android.hardware.audio.service)/status"
Test: adb shell 'ps -Tl -p $(pgrep -of android.hardware.audio.service)'
Bug: 181148259
Bug: 260918856
Bug: 261228892
Bug: 261686532
Bug: 262803152
Merged-In: I59ea99e8a1720f61954747f6c29e14cfea9a0f56
Change-Id: I59ea99e8a1720f61954747f6c29e14cfea9a0f56