leds: various: use only available OF children

Various drivers count and iterate over OF children nodes via
of_get_child_count and for_each_child_of_node. Instead they should use
of_get_available_child_count and for_each_available_child_of_node, so
that if a given node has the `status` property set to `disabled`, the
child will be ignored.

Signed-off-by: Marek Behún <[email protected]>
Cc: Andrew Lunn <[email protected]>
Cc: Andrey Utkin <[email protected]>
Cc: Baolin Wang <[email protected]>
Cc: Baolin Wang <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Christian Mauderer <[email protected]>
Cc: Chunyan Zhang <[email protected]>
Cc: Dan Murphy <[email protected]>
Cc: David Rivshin <[email protected]>
Cc: Haojian Zhuang <[email protected]>
Cc: H. Nikolaus Schaller <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Milo Kim <[email protected]>
Cc: NeilBrown <[email protected]>
Cc: Nikita Travkin <[email protected]>
Cc: Orson Zhai <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Philippe Retornaz <[email protected]>
Cc: Riku Voipio <[email protected]>
Cc: Simon Guinot <[email protected]>
Cc: Simon Shields <[email protected]>
Cc: Vasant Hegde <[email protected]>
Cc: Xiaotong Lu <[email protected]>
Signed-off-by: Pavel Machek <[email protected]>

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