AVB: add helper file for AVB applications

This patch adds a helper that can be used by avb
applications.

Signed-off-by: Lad, Prabhakar <prabhakar.lad@symphonyteleca.com>
AVB: Examples: add application for streaming

This patch adds application for streaming live data.

Signed-off-by: Lad, Prabhakar <prabhakar.lad@symphonyteleca.com>