ACPI / OF: Rename of_node() and acpi_node() to to_of_node() and to_acpi_node()

Commit 8a0662d9 introduced of_node and acpi_node symbols in global namespace
but there were already ~63 of_node local variables or function parameters
(no single acpi_node though, but anyway).

After debugging undefined but used of_node local varible (which turned out
to reference static function of_node() instead) it became clear that the names
for the functions are too short and too generic for global scope.

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/leds/leds-gpio.c

@@ -191,7 +191,7 @@ static struct gpio_leds_priv *gpio_leds_create(struct platform_device *pdev)
 			goto err;
 		}
 
-		np = of_node(child);
+		np = to_of_node(child);
 
 		if (fwnode_property_present(child, "label")) {
 			fwnode_property_read_string(child, "label", &led.name);