dm: core: device: add function: dev_get_uclass_name()

This commit extends the driver model device's API by function:
- dev_get_uclass_name()

And this function returns the device's uclass driver name if:
- given dev pointer, is non_NULL
otherwise, the NULL pointer is returned.

Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Cc: Simon Glass <sjg@chromium.org>
Acked-by: Simon Glass <sjg@chromium.org>

drivers/core/device.c

@@ -512,6 +512,14 @@ enum uclass_id device_get_uclass_id(struct udevice *dev)
 	return dev->uclass->uc_drv->id;
 }
 
+const char *dev_get_uclass_name(struct udevice *dev)
+{
+	if (!dev)
+		return NULL;
+
+	return dev->uclass->uc_drv->name;
+}
+
 #ifdef CONFIG_OF_CONTROL
 fdt_addr_t dev_get_addr(struct udevice *dev)
 {