mm: remove unused TestSetPageLocked() interface

TestSetPageLocked() isn't being used anywhere.  Also, using it would
likely be an error, since the proper interface trylock_page() provides
stronger ordering guarantees.

Signed-off-by: Michel Lespinasse <walken@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>