Don't emit implicit clock warnings for SyncReadMem.readWrite when explicit clocks are used (backport #3313)

[mergify]

This is an automatic backport of pull request #3313 done by Mergify.

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Original PR Body

Fixes a bug where calling SyncReadMem.readWrite with an explicit Clock that is different from the memory's clock raises an implicit clock warning anyways, when this shouldn't be the case.

Contributor Checklist

• Did you add Scaladoc to every public function/method?
• Did you add at least one test demonstrating the PR?
• Did you delete any extraneous printlns/debugging code?
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• Did you add text to be included in the Release Notes for this change?

Type of Improvement

• Bugfix

Desired Merge Strategy

• Squash

Release Notes

Reviewer Checklist (only modified by reviewer)

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• Did you mark the proper milestone (Bug fix: 3.5.x or 3.6.x depending on impact, API modification or big change: 5.0.0)?
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