Add bootgen-xlnx to Breaks, Replaces, and Provides

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Rebase the debdiff because xilinx-bootgen has been upgraded from 2022.1-1 to 2022.2-1

I fixed this with other approch in debian.
Could you check it?
  https://salsa.debian.org/xilinx-packages-team/xilinx-bootgen/-/commit/b733ea7590e1c02323c9cb81730ac57488563f08

Looks like the fix upstream from @iwamatsu has already sync'd to lunar -- thanks! I'm just looking at the xlnx-firmware side of things for LP: #2000773 and bootgen-xlnx in LP: #1998728

Hmm, come to think of it, I'm afraid I'm going to overwrite @iwamatsu's upstream changes in order to effect the rename of xlnx-bootgen in Ubuntu, sorry! It'll be a temporary delta to xilinx-bootgen to include an empty transitional bootgen-xlnx definition which we can drop at the next release.

This is just the simplest way to deal with the rename without causing any unnecessary work for Debian, and without doing lots of surgery on xlnx-bootgen. I'll upload a debdiff here shortly.

One additional note: we don't need Provides here as firstly the transitional bootgen-xlnx package depends directly on xilinx-bootgen and we want both it and the empty transitional package to be installable simultaneously, and secondly I'm intending to patch xlnx-firmware to depend on "xilinx-bootgen | bootgen-xlnx" to permit it to work with the legacy package (in case xlnx-firmware migrates before the new package), and to permit the empty transitional package to be uninstalled and the dependencies still be satisfied.

verified packages on lunar by installing or upgrading them. Here are my test steps:

Install xlnx-firmware (2022.1-2-0ubuntu1), bootgen-xlnx (2022.1-0ubuntu1), and u-boot-zynqmp (2020.2-0ubuntu11).

Scenario 1: Upgrade bootgen-xlnx
$ apt-get install bootgen-xlnx
bootgen-xlnx is upgraded to 2022.2-2ubuntu1
xilinx-bootgen (2022.2-2ubuntu1) is installed

Scenario 2: Upgrade xlnx-firmware
apt-get install xlnx-firmware
xlnx-firmware is upgraded to 2022.1-2-0ubuntu2

Scenario 3: Install xilinx-bootgen
$ apt-get install xilinx-bootgen
bootgen-xlnx is upgraded to 2022.2-2ubuntu1
xilinx-bootgen is upgraded to 2022.2-2ubuntu1

Scenario 4: Upgarde xlnx-firmware bootgen-xlnx
$ apt-get install xlnx-firmware bootgen-xlnx
bootgen-xlnx is upgraded to 2022.2-2ubuntu1
xilinx-bootgen (2022.2-2ubuntu1) is installed
xlnx-firmware is upgraded to 2022.1-2-0ubuntu2

Package can be installed or upgraded without any problem.