dm: core: Drop ofnode_is_available()

This function is also available as ofnode_is_enabled(), so use that
instead.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/pci/pci_mvebu.c b/drivers/pci/pci_mvebu.c
index 5bd340a..93a7508 100644
--- a/drivers/pci/pci_mvebu.c
+++ b/drivers/pci/pci_mvebu.c
@@ -740,7 +740,7 @@
 
 	/* First phase: Fill mvebu_pcie struct for each port */
 	ofnode_for_each_subnode(subnode, dev_ofnode(parent)) {
-		if (!ofnode_is_available(subnode))
+		if (!ofnode_is_enabled(subnode))
 			continue;
 
 		pcie = calloc(1, sizeof(*pcie));