dm: pci: Add a dm_ prefix to pci_bus_find_bdf()

Most driver model PCI functions have a dm_ prefix. At some point, when the
old code is converted to driver model and the old functions are removed, we
will drop that prefix.

For consistency, we should use the dm_ prefix for all driver model
functions. Update pci_bus_find_bdf() accordingly.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c
index f6ca58b..2828055 100644
--- a/drivers/pci/pci-uclass.c
+++ b/drivers/pci/pci-uclass.c
@@ -128,7 +128,7 @@
 	return -ENODEV;
 }
 
-int pci_bus_find_bdf(pci_dev_t bdf, struct udevice **devp)
+int dm_pci_bus_find_bdf(pci_dev_t bdf, struct udevice **devp)
 {
 	struct udevice *bus;
 	int ret;