remoteproc: imx_rproc: Use devm_add_action_or_reset() for workqueue cleanup

remoteproc: imx_rproc: Use devm_add_action_or_reset() for workqueue cleanup

Replace manual destroy_workqueue() calls in error and remove paths with a
devm_add_action_or_reset() helper. Ensure the workqueue is properly
cleaned up with the device lifecycle, and simplify error handling in probe
by removing now-unnecessary labels and cleanup steps.

No functional changes.

Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Daniel Baluta <daniel.baluta@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Link: https://lore.kernel.org/r/20250926-imx_rproc_v3-v3-2-4c0ec279cc5f@nxp.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>