audio: Provide code for parsing surround sound config from XML am: aa8f76af92 am: 373c6167f0 am: 628e53a343

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2593365

Change-Id: I94ec749365efc3901dd8f298cb6cefe64fd7a41c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>