ANDROID: virtio_balloon: Rename header guard in uapi header file

This will allow introduction of a Linux-private header file with the
usual guard name, which would currently conflict with this uapi
header.

Bug: 381400679
Bug: 357781595
Ignore-Checkpatch: Trivial change to a uapi header file with no SPDX line
Change-Id: I0a4f949cfb539becab2f706c04562aecd16866b3
Signed-off-by: Keir Fraser <keirf@google.com>

include/uapi/linux/virtio_balloon.h

@@ -1,5 +1,5 @@
-#ifndef _LINUX_VIRTIO_BALLOON_H
-#define _LINUX_VIRTIO_BALLOON_H
+#ifndef _UAPI_LINUX_VIRTIO_BALLOON_H
+#define _UAPI_LINUX_VIRTIO_BALLOON_H
 /* This header is BSD licensed so anyone can use the definitions to implement
  * compatible drivers/servers.
  *
@@ -128,4 +128,4 @@ struct virtio_balloon_stat {
 	__virtio64 val;
 } __attribute__((packed));
 
-#endif /* _LINUX_VIRTIO_BALLOON_H */
+#endif /* _UAPI_LINUX_VIRTIO_BALLOON_H */