Revert "sunrpc: clean cache_detail immediately when flush is written frequently"

Ondrej reports that certain SELinux tests are failing after commit
fc2a169c ("sunrpc: clean cache_detail immediately when flush is
written frequently"), merged during the v6.15 merge window.

Reported-by: Ondrej Mosnacek <omosnace@redhat.com>
Fixes: fc2a169c ("sunrpc: clean cache_detail immediately when flush is written frequently")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>