s390: hypfs: Move diag implementation and data definitions

Diag 204 data and function definitions currently live in the hypfs
files. As KVM will be a consumer of this data, we need to make it
publicly available and move it to the appropriate diag.{c,h} files.

__attribute__ ((packed)) occurences were replaced with __packed for
all moved structs.

Signed-off-by: Janosch Frank <[email protected]>
Reviewed-by: David Hildenbrand <[email protected]>
Acked-by: Michael Holzheu <[email protected]>
Signed-off-by: Christian Borntraeger <[email protected]>

Author: Janosch Frank