Silicon/Openmoko: add driver for ChaosKey RNG USB device

This is a continuation of the work carried out by Leif Lindholm to
implement a driver for the ChaosKey USB device. This driver uses the
UEFI driver model, which is a slightly awkward fit, due to the fact
that a UEFI implementation may legally only instantiate those protocols
that are needed to access the device path that the active Boot####
options refers to.

However, it is expected that UEFI implementations typically instantiate
all USB I/O protocols and connect them as well, as those are required
for a USB keyboard to be able to control the boot sequence. This should
result in this driver being connected and given the opportunity to
produce the EFI_RNG_PROTOCOL.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>

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