Set absolute volume command as set volume offset API call for PTS test

No API to set absolute volume via VCP or LE audio profile. Only API
could set volume offset, so trigger set absolute volume together for PTS
VCP test only

Bug: 234429084
Test: PTS VCP absolute test pass
Change-Id: Ib57d5499ee0197f1f321fc7b5187b9080ecab492
Merged-In: Ib57d5499ee0197f1f321fc7b5187b9080ecab492
(cherry picked from commit 62f9a5fe)