usb/uas: add usb_pipe_usage_descriptor

usb/uas: add usb_pipe_usage_descriptor

BugLink: http://bugs.launchpad.net/bugs/901215

usb_pipe_usage_descriptor defines the struct which is used to describe
the type of the endpoint in UAS (status/command/data in+out). It will be
used by the UAS gadget, the host code is using a char array for the
access.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
(cherry picked from commit ee398b59ec1dc3ce1d60518f4ea644907893414b)

Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Acked-by: Herton Krzesinski <herton.krzesinski@canonical.com>