Clean up duplicate includes in fs/ecryptfs/

This patch cleans up duplicate includes in
	fs/ecryptfs/

Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Cc: Michael A Halcrow <mahalcro@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>