Adds support for Digilent Genesys 2 and AMD/Xilinx ZCU104 FPGA boards.

[milovanovic]

Introduces initial support for Digilent Genesys 2 and AMD/Xilinx ZCU104 FPGA development boards.

Related PRs:

Recently Genesys 2 and ZCU104 board support added in FPGA Shells for the Rocket Chip Generator:

• Genesys 2: Adds initial support for Genesys 2 board. chipsalliance/rocket-chip-fpga-shells#35
• ZCU104: Adds initial support for AMD ZCU104 board. chipsalliance/rocket-chip-fpga-shells#33

Previously Digilent Nexys Video development board support was added through #1616.

Type of change:

• Bug fix
• New feature
• Other enhancement

Impact:

• RTL change
• Software change (RISC-V software)
• Build system change
• Other

Contributor Checklist:

• Did you set main as the base branch?
• Is this PR's title suitable for inclusion in the changelog and have you added a changelog:<topic> label?
• Did you state the type-of-change/impact?
• Did you delete any extraneous prints/debugging code?
• Did you mark the PR with a changelog: label?
• (If applicable) Did you update the conda .conda-lock.yml file if you updated the conda requirements file?
• (If applicable) Did you add documentation for the feature?
• (If applicable) Did you add a test demonstrating the PR?

• (If applicable) Did you mark the PR as Please Backport?

CI Help:
Add the following labels to modify the CI for a set of features.
Generally, a label added only affect subsequent changes to the PR (i.e. new commits, force pushing, closing/reopening).
See ci:* for full list of labels:

• ci:fpga-deploy - Run FPGA-based E2E testing
• ci:local-fpga-buildbitstream-deploy - Build local FPGA bitstreams for platforms that are released
• ci:disable - Disable CI