Witherspoon
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This is the Witherspoon machine layer.

Witherspoon, or AC922, is an IBM POWER9 two-socket, 2U Accelerated Compute
Server with up to 6 NVIDIA Tesla GPUs. More information can be found
[here](https://www.ibm.com/us-en/marketplace/power-systems-ac922).

In addition to witherspoon, this layer contains additional machine
configurations such as swift. The default machine target is witherspoon,
so in order to build a different configuration, or to build witherspoon
after building a different one, set the MACHINE environment to the desired
configuration name as follows (this is only needed once):

    export MACHINE="<machine_configuration>"; \
    export BB_ENV_EXTRAWHITE="$BB_ENV_EXTRAWHITE MACHINE"

Then build:

    bitbake obmc-phosphor-image