Add a library that wraps the key IOKit entrypoints used in the macOS
UABI for AGX. Our wrapped routines print information about the kernel
calls made and dump work submitted to the GPU using agxdecode. This code
has two major use cases:
1. Debugging Mesa, particularly around the undocumented macOS
user-kernel interface. Logs from Mesa may compared to Metal to check
that the UABI is being used correcrly.
2. Reverse-engineering the hardware, using this as glue to get at the
"interesting" GPU memory.
Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16512>
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