dm: core: Add a uclass pre_probe() method for devices

Some uclasses want to set up a device before it is probed. Add a method
for this.

An example is with PCI, where a PCI uclass wants to set up its private
data for later use. This allows the device's uclass() method to make calls
whcih use that data (for example, read PCI memory regions from device
tree, set up bus numbers).

Signed-off-by: Simon Glass <sjg@chromium.org>

include/dm/uclass-internal.h

@@ -44,15 +44,16 @@ int uclass_bind_device(struct udevice *dev);
 int uclass_unbind_device(struct udevice *dev);
 
 /**
- * uclass_pre_probe_child() - Deal with a child that is about to be probed
+ * uclass_pre_probe_device() - Deal with a device that is about to be probed
  *
  * Perform any pre-processing that is needed by the uclass before it can be
- * probed.
+ * probed. This includes the uclass' pre-probe() method and the parent
+ * uclass' child_pre_probe() method.
  *
  * @dev:	Pointer to the device
  * #return 0 on success, -ve on error
  */
-int uclass_pre_probe_child(struct udevice *dev);
+int uclass_pre_probe_device(struct udevice *dev);
 
 /**
  * uclass_post_probe_device() - Deal with a device that has just been probed