Fix visibility for views (backport #3818)

[mergify]

This is an automatic backport of pull request #3818 done by Mergify.

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Original PR Body

A latent issue with how Binding and lexical scope checking (aka visiblity) works in Chisel is that it is assumes a single "location" for a given Data. Aggregate Views can have multiple locations so this logic needs to be generalized. I started doing that work but it's a much larger overhaul than I was willing to commit to for a bug fix, so I ditched that idea and did something more focused. We do need to make that change eventually though.

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?
• Did you specify the type of improvement?
• Did you add appropriate documentation in docs/src?
• Did you request a desired merge strategy?
• Did you add text to be included in the Release Notes for this change?

Type of Improvement

• Bugfix

Desired Merge Strategy

• Squash

Release Notes

DataMirror.isVisible and other things checking visibility now work properly for views.

Reviewer Checklist (only modified by reviewer)

• Did you add the appropriate labels? (Select the most appropriate one based on the "Type of Improvement")
• Did you mark the proper milestone (Bug fix: 3.6.x, 5.x, or 6.x depending on impact, API modification or big change: 7.0)?
• Did you review?
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• Did you do one of the following when ready to merge:
  • Squash: You/ the contributor Enable auto-merge (squash), clean up the commit message, and label with Please Merge.
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