dm: core: Drop uclass_find_device_by_phandle() with of-platdata

At present this function is included in the build but with of-platdata it
only services to produce a confusing link error complaining about a call
to dev_read_u32_default().

Drop it so that any call to uclass_find_device_by_phandle() is flagged as
an error, making it easier to see what is going on.

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

drivers/core/uclass.c

@@ -394,7 +394,7 @@ done:
 	return ret;
 }
 
-#if CONFIG_IS_ENABLED(OF_CONTROL)
+#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
 int uclass_find_device_by_phandle(enum uclass_id id, struct udevice *parent,
 				  const char *name, struct udevice **devp)
 {