rcutorture: Make Trivial RCU ignore onoff_interval and shuffle_interval

rcutorture: Make Trivial RCU ignore onoff_interval and shuffle_interval

Trivial RCU is a textbook implementation that is not used in the
Linux kernel, but tested to keep textbooks (and presentations) honest.
It is so trivial that it cannot deal with either CPU hotplug or external
migration from one CPU to another.  This commit therefore splats whenever
onoff_interval or shuffle_interval are non-zero, and then sets them to
zero in order to avoid false-positive failures.

Those wishing to set these module parameters in order to force failures
in Trivial RCU are free to revert this commit.  Just don't expect me to
be sympathetic to any resulting bug reports!

Reported-by: kernel test robot <oliver.sang@intel.com>
Closes: https://lore.kernel.org/oe-lkp/202505131651.af6e81d7-lkp@intel.com
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Neeraj Upadhyay (AMD) <neeraj.upadhyay@kernel.org>