ucm: header - ALSA Use Case Manager

ucm: header - ALSA Use Case Manager

This patch adds the API header for alsa-lib Use Case Management support.

This file defines the public interface exported by UCM to client
applications.

UCM development has been kindly sponsored by Texas Instruments Inc,
Wolfson Microelectronics PLC and Slimlogic Ltd.

CC: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Stefan Schmidt <stefan@slimlogic.co.uk>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Justin Xu <justinx@slimlogic.co.uk>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>