Snowball: Enable USB composite device

Support for USB classes - RNDIS, Mass storage, ACM and MTP
Default configuration is Mass storage and ADB
Added changes for SDcard to be accessed through MTP

Change-Id: I9848231cbcd55b71ad3be37537f0c8836650bab0
Signed-off-by: Supriya Karanth <supriya.karanth@stericsson.com>
Signed-off-by: Patrik Ryd <patrik.ryd@linaro.org>
4 files changed