AudioService: refine new SCO audio management logic

Improvement on top of commit 941ab298 that retricts the condition
in AudioDeviceBroker.shouldStartScoForAttributionSource() to
distinguish "Telecom" package from other clients with system AID.

Bug: 366363233
Test: call audio routing regression
Flag: android.media.audio.sco_managed_by_audio
Change-Id: Ife3002ee8b448ab529072e50cedd226acaa7a46a