Enable WARL custom CSRs, long-latency CSR accesses (backport #3388)

[mergify]

This is an automatic backport of pull request #3388 done by Mergify.
Cherry-pick of 005c6db has failed:

On branch mergify/bp/master/pr-3388
Your branch is up to date with 'origin/master'.

You are currently cherry-picking commit 005c6dbe1.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   src/main/scala/rocket/CSR.scala
	modified:   src/main/scala/rocket/PTW.scala
	modified:   src/main/scala/tile/CustomCSRs.scala
	modified:   src/main/scala/tile/LazyRoCC.scala

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   src/main/scala/rocket/RocketCore.scala

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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