dm: core: Alloc uclass-private data to be cache-aligned

There is no reason why this feature should not be supported for uclass-
private data. Update the code accordingly.

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

drivers/core/device.c

@@ -331,7 +331,8 @@ int device_probe(struct udevice *dev)
 	/* Allocate private data if requested and not reentered */
 	size = dev->uclass->uc_drv->per_device_auto_alloc_size;
 	if (size && !dev->uclass_priv) {
-		dev->uclass_priv = calloc(1, size);
+		dev->uclass_priv = alloc_priv(size,
+					      dev->uclass->uc_drv->flags);
 		if (!dev->uclass_priv) {
 			ret = -ENOMEM;
 			goto fail;

include/dm/uclass.h

@@ -44,6 +44,9 @@ struct udevice;
 /* Members of this uclass sequence themselves with aliases */
 #define DM_UC_FLAG_SEQ_ALIAS			(1 << 0)
 
+/* Same as DM_FLAG_ALLOC_PRIV_DMA */
+#define DM_UC_FLAG_ALLOC_PRIV_DMA		(1 << 5)
+
 /**
  * struct uclass_driver - Driver for the uclass
  *