rtla/osnoise: Set OSNOISE_WORKLOAD to true

rtla/osnoise: Set OSNOISE_WORKLOAD to true

If running rtla osnoise with NO_OSNOISE_WORKLOAD, it reports no samples:

$ echo NO_OSNOISE_WORKLOAD > /sys/kernel/tracing/osnoise/options
$ rtla osnoise hist -d 10s
Index
over: 0
count: 0
min: 0
avg: 0
max: 0

This situation can also happen when running rtla-osnoise after an
improperly exited rtla-timerlat run.

Set OSNOISE_WORKLOAD in rtla-osnoise, too, similarly to what we
already did for timerlat in commit 217f0b1e990e ("rtla/timerlat_top: Set
OSNOISE_WORKLOAD for kernel threads") and commit d8d866171a41
("rtla/timerlat_hist: Set OSNOISE_WORKLOAD for kernel threads").

Note that there is no user workload mode for rtla-osnoise yet, so
OSNOISE_WORKLOAD is always set to true.

Cc: Luis Goncalves <lgoncalv@redhat.com>
Link: https://lore.kernel.org/20250320092500.101385-4-tglozar@redhat.com
Fixes: 1eceb2fc2ca5 ("rtla/osnoise: Add osnoise top mode")
Fixes: 829a6c0b5698 ("rtla/osnoise: Add the hist mode")
Signed-off-by: Tomas Glozar <tglozar@redhat.com>
Reviewed-by: John Kacur <jkacur@redhat.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>