Add support for virtual USB host controller intended for use
together with virtual bus and virtual device controllers.
This driver is not an emulation of any real host controller.
The driver has initial support for handling control and bulk
transfers.
Signed-off-by: Johann Fischer <johann.fischer@nordicsemi.no>
Add common layer of UHC API and MAX3421E host controller driver.
This implements the bare minimum necessary to communicate with
one peripheral device.
Signed-off-by: Johann Fischer <johann.fischer@nordicsemi.no>