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>
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 6bc612b..5d8b2b3 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -2040,14 +2040,14 @@
 	if (is_of_node(fwnode)) {
 		enum of_gpio_flags flags;
 
-		desc = of_get_named_gpiod_flags(of_node(fwnode), propname, 0,
+		desc = of_get_named_gpiod_flags(to_of_node(fwnode), propname, 0,
 						&flags);
 		if (!IS_ERR(desc))
 			active_low = flags & OF_GPIO_ACTIVE_LOW;
 	} else if (is_acpi_node(fwnode)) {
 		struct acpi_gpio_info info;
 
-		desc = acpi_get_gpiod_by_index(acpi_node(fwnode), propname, 0,
+		desc = acpi_get_gpiod_by_index(to_acpi_node(fwnode), propname, 0,
 					       &info);
 		if (!IS_ERR(desc))
 			active_low = info.active_low;