usb: add support for microsoft os descriptors
This patch adds support for special usb descriptors used by microsoft
windows. They allow more fine-grained control over driver binding and
adding entries to the registry for configuration.
As this is a guest-visible change the "msos-desc" compat property
has been added to turn this off for 1.7 + older
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
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hw/usb/desc-msos.c
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