include/linux/balloon_compaction.h: drop unused function stubs

These are leftovers from the pre-"general non-lru movable page" era.

Link: http://lkml.kernel.org/r/20190329122649.28404-1-david@redhat.comSigned-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Pankaj Gupta <pagupta@redhat.com>
Acked-by: Rafael Aquini <aquini@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/balloon_compaction.h

@@ -151,21 +151,6 @@ static inline void balloon_page_delete(struct page *page)
 	list_del(&page->lru);
 }
 
-static inline bool __is_movable_balloon_page(struct page *page)
-{
-	return false;
-}
-
-static inline bool balloon_page_movable(struct page *page)
-{
-	return false;
-}
-
-static inline bool isolated_balloon_page(struct page *page)
-{
-	return false;
-}
-
 static inline bool balloon_page_isolate(struct page *page)
 {
 	return false;