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Cleanup SRCU remnants from Kconfig files

Myron Stowe requested to merge mstowe1/centos-stream-9:redhat/j18042 into main
Upstream recently removed the Sleepable Read-Copy Update's (SRCU) kernel
configuration option ('CONFIG_SRCU'):
  merge commit 5dfb75e842e0 Merge tag 'rcu.6.4.april5.20233     v6.4-rc1
    commit e035e8876e6c "rcu: Remove CONFIG_SRCU").
  merge commit 8cc01d43f882 Merge tag 'rcu.2023.02.10a'         v6.3-rc1

This removal was back-ported to RHEL:
  [RHEL9.4] Backport upstream RCU commits up to v6.4 with additional fixes
  https://issues.redhat.com/browse/RHEL-5228
  rcu: Backport upstream RCU commits up to v6.4
  https://gitlab.com/.../centos-stream-9/-/merge_requests/3099

However, after the removal, some remnants were left scattered in various
'Kconfig' files.  These should be innocuous no-ops, but it's best to clean
things up.

-v2  Re-based patch series due to GitLab reporting a conflict with MR 3289.
     Patch 02 of 17 was modified to account for the conflict which was with
     pre-context content.
     

JIRA: https://issues.redhat.com/browse/RHEL-18042
Depends: N/A

Signed-off-by: Myron Stowe <mstowe@redhat.com>
Edited by Myron Stowe

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