unregister_key_type() no longer needs to retype live keys as keys and
restrictions pin the module while they reference it.
Remove key_type_dead and associated code from the keyring GC.
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
Sashiko has reviewed this patch and found no issues.
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Sashiko AI review · https://sashiko.dev/#/patchset/20261103030226.2685251-1-jarkko@kernel.org?part=10