Move everyting KASLR related to <asm/page.h>,
similarly to many other architectures.
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Suggested-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>