dt-bindings: arm: ti: Add bindings for BeagleBone AI-64

This board is based on the ti,j721e

https://beagleboard.org/ai-64
https://git.beagleboard.org/beagleboard/beaglebone-ai-64



Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
Acked-by: Rob Herring <robh@kernel.org>
CC: Nishanth Menon <nm@ti.com>
CC: Jason Kridner <jkridner@beagleboard.org>
CC: Drew Fustini <drew@beagleboard.org>
Signed-off-by: Nishanth Menon <nm@ti.com>
Link: https://lore.kernel.org/r/20221118163139.3592054-1-robertcnelson@gmail.com