audio: Provide code for parsing surround sound config from XML am: aa8f76af92

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

Change-Id: I7932cbfdc113d1ee275b8eca8adca6689cf1171d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>