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>

include/acpi/acpi_bus.h

@@ -385,7 +385,7 @@ static inline bool is_acpi_node(struct fwnode_handle *fwnode)
 	return fwnode && fwnode->type == FWNODE_ACPI;
 }
 
-static inline struct acpi_device *acpi_node(struct fwnode_handle *fwnode)
+static inline struct acpi_device *to_acpi_node(struct fwnode_handle *fwnode)
 {
 	return is_acpi_node(fwnode) ?
 		container_of(fwnode, struct acpi_device, fwnode) : NULL;