mm/hugetlb: remove arch_prepare/release_hugepage from arch headers

mm/hugetlb: remove arch_prepare/release_hugepage from arch headers

Nobody used these hooks so they were removed from common code, and can now
be removed from the architectures.

Signed-off-by: Dominik Dingel <[email protected]>
Acked-by: Martin Schwidefsky <[email protected]>
Acked-by: Ralf Baechle <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Christian Borntraeger <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>