gta4xl-common: Import libaudioproxy from universal9820 BSP tree

* From https://gitlab.com/Linaro/96boards/e850-96/device/samsung/universal9820/-/tree/2d41352822861e02b1ba5df004a1240a770c9ba7/audio/proxy

Change-Id: I0ef0fb98115b1227260a3cd149ce4a26e0bfe585
14 files changed