Split getSurroundSound method in 2 methods.

Split getSurroundSound in:
getSurroundSound for formats supported by source android device
getReportedSurroundSound for formats reported by any connected sound
device like soundbar etc.

Bug: 177990551
Test: atest AudioPolicyManagerTestForHdmi
Change-Id: Iac811315049f0598c930afd75f069f058080dad4