arm64: dts: zynqmp: Add support for Avnet Ultra96 rev1 board

Avnet Ultra96 rev1 board is commercialized Xilinx zcu100 revC/D
internal board. The patch is reusing zcu100 revC files but changing
model description and compatible strings which are used for example by
libmraa.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>