drivers: arch_topology: use __free attribute instead of of_node_put()

Introduce the __free attribute for scope-based resource management.
Resources allocated with __free are automatically released at the end of
the scope. This enhancement aims to mitigate memory management issues
associated with forgetting to release resources by utilizing __free
instead of of_node_put().

The declaration of the device_node used within the do-while loops is
moved directly within the loop so that the resource is automatically
freed at the end of each iteration.

Acked-by: Sudeep Holla <[email protected]>
Suggested-by: Julia Lawall <[email protected]>
Signed-off-by: Vincenzo Mezzela <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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