drm/xe: Relax runtime pm protection during execution

drm/xe: Relax runtime pm protection during execution

Limit the protection only during moments of actual job execution,
and introduce protection for guc submit fini, which is currently
unprotected due to the absence of exec_queue life protection.

In the regular use case scenario, user space will create an
exec queue, and keep it alive to reuse that until it is done
with that kind of workload.

For the regular desktop cases, it means that the exec_queue
is alive even on idle scenarios where display goes off. This
is unacceptable since this would entirely block runtime PM
indefinitely, blocking deeper Package-C state. This would be
a waste drainage of power.

Cc: Matthew Brost <matthew.brost@intel.com>
Tested-by: Francois Dugast <francois.dugast@intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240522170105.327472-3-rodrigo.vivi@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>