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Add support for OS descriptors. The new format of descriptors is used, because the "flags" field is required for extensions. os_count gives the number of OSDesc[] elements. The format of descriptors is given in include/uapi/linux/usb/functionfs.h. For extended properties descriptor the usb_ext_prop_desc structure covers only a part of a descriptor, because the wPropertyNameLength is unknown up front. Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com> Acked-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Felipe Balbi <balbi@ti.com>