Add Verilog blackbox TLDevice example

[jerryz123]

This Verilog TL device has both a RegisterNode (ManagerNode) for control, and a ClientNode for bus access.

@vikramjain236 can you take over this? Add comments/docs, flesh out the example, etc.?

Related PRs / Issues:

Type of change:

• Bug fix
• New feature
• Other enhancement

Impact:

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

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