suservo: support operating with one urukul

[jordens]

implemented by wiring up the second Urukul to dummy pins
tested on bonn1master/bonn1satellite

Signed-off-by: Robert Jördens [email protected]

ARTIQ Pull Request

Description of Changes

Related Issue

#1339 for more than two Urukul

Type of Changes

	Type
✓	✨ New feature
✓	🔨 Refactoring

Steps (Choose relevant, delete irrelevant before submitting)

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Documentation Changes

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