[cudax] Simplify implementation of device attributes

[davebayer]

This PR simplifies implementation of device attributes and removes duplicate code.

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[bernhardmgruber]

I think this change breaks the current design. Also, since this code was merged not too long ago, @ericniebler may have had reasons for splitting __dev_attr and __dev_attr_with_type. Let's hear what he says.

[miscco]

/ok to test

[bernhardmgruber]

The change is fine, but I would still prefer to have @ericniebler's opinion on whether there was intent in splitting __dev_attr and __dev_attr_with_type.

[github-actions]

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👃 Inspect Changes

Modifications in project?

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Modifications in project or dependencies?

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	CCCL Infrastructure
	libcu++
	CUB
	Thrust
+/-	CUDA Experimental
	python
	CCCL C Parallel Library
	Catch2Helper

🏃‍ Runner counts (total jobs: 26)

#	Runner
18	linux-amd64-cpu16
4	linux-arm64-cpu16
2	windows-amd64-cpu16
2	linux-amd64-gpu-v100-latest-1

[ericniebler]

looks good

[bernhardmgruber]

Great! Thanks for the contribution!