With these two items it is possible to control the power of the device
and access its SD card when off.
This adds support for using a single rpi_3 with
- SDwire used to allow updating the uSD card over USB
- Ykush (YepKit) to control power to the rpi_3
There are a few udev changes as well, not included here.
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
