rcutorture: Rename NOCB configs from TREE* to NOCB* naming

Rename TREE01 to NOCB01 and TREE08 to NOCB02 for clearer naming
that reflects their purpose of testing RCU no-callback CPU offloading.

- NOCB01 (was TREE01): Tests NOCB with dynamic toggle on subset of CPUs
- NOCB02 (was TREE08): Tests NOCB with all CPUs offloaded (stress test)

TREE05 is NOT renamed because while it has CONFIG_RCU_NOCB_CPU=y, it
has no rcu_nocbs= boot parameter, so it doesn't actually exercise NOCB
code paths at runtime. It remains TREE05 as its purpose is locking
verification, not NOCB testing.

NOCB02 is not added to CFLIST to avoid increasing the default test
duration; it was not previously in CFLIST as TREE08.

Also update documentation and scripts to reference NOCB01 instead of
TREE01.

Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
9 files changed