audio: update audio_policy_volumes.xml

Update below stream's volume curves to refine system sound output
from speaker too loud in the lowest volume.

  <volume stream="AUDIO_STREAM_SYSTEM" deviceCategory="DEVICE_CATEGORY_SPEAKER">
  <volume stream="AUDIO_STREAM_RING" deviceCategory="DEVICE_CATEGORY_SPEAKER">
  <volume stream="AUDIO_STREAM_ALARM" deviceCategory="DEVICE_CATEGORY_SPEAKER">
  <volume stream="AUDIO_STREAM_NOTIFICATION" deviceCategory="DEVICE_CATEGORY_SPEAKER">
  <volume stream="AUDIO_STREAM_DTMF" deviceCategory="DEVICE_CATEGORY_SPEAKER">

Refine audio-tables.mk location to make sure the xml is updated.

Bug: 195387287
Test: QMC verified
Test: Local built and verified vendor/etc/audio_policy_volumes.xml is correct one

Signed-off-by: Robert Lee <lerobert@google.com>
Change-Id: I13188d7470092448a2660f89d43cf13a56c22edc
6 files changed