Add support to pull in a .Xilinx directory to allow beta devices to be enabled inside docker container

See https://docs.xilinx.com/r/en-US/ug835-vivado-tcl-commands/Tcl-Initialization-Scripts for information on using tcl init scripts

Signed-off-by: Fionn O'Donohoe <fionno@xilinx.com>

This reverts commit 1f17010e.

This reverts commit 81fefd99.

This reverts commit fc9e880a.

This reverts commit fc9e880a.

This reverts commit 0297b55f, reversing
changes made to b3110eec.

Docker installs XRT when building the container. This patch
allows the maintainer to set the Vitis tools version and the
hash of the supported XRT version verified to work with FINN.
This is the way XRT versioning is managed in AWS instances.

FINN-13 was caused by using 2022.1 Vitis and an old XRT version
in usage during 2020.1. Version controlling the sets of tools
will prevent bugs like this from recurring.

Signed-off-by: Fionn O'Donohoe <fionno@xilinx.com>

This reverts commit fe4a150c, reversing
changes made to c98c2211.

Signed-off-by: Fionn O'Donohoe <fionno@xilinx.com>

Signed-off-by: Fionn O'Donohoe <fionno@xilinx.com>

This reverts commit 00aa2898, reversing
changes made to 39376a94.