Fix missing qualification of pow in two instances

[miscco]

This might lead to ambiguous overload resolution and breaks some builds.

Fixes nvbug4480737

[github-actions]

🟩 CI Results: Pass: 100%/198 | Total Time: 2d 13h | Avg Time: 18m 47s | Hits: 86%/132439

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🏃‍ Runner counts (total jobs: 198)

#	Runner
154	linux-amd64-cpu16
16	linux-arm64-cpu16
16	linux-amd64-gpu-v100-latest-1
12	windows-amd64-cpu16

👃 Inspect Changes

Modifications in project?

	Project
	CCCL Infrastructure
	libcu++
	CUB
+/-	Thrust
	CUDA Experimental

Modifications in project or dependencies?

	Project
	CCCL Infrastructure
	libcu++
+/-	CUB
+/-	Thrust
	CUDA Experimental