hvm/vpmu: Prevent dump handlers from incorrectly mutating state

hvm/vpmu: Prevent dump handlers from incorrectly mutating state

Discovered by Coverity, CID 1055181

core2_vpmu_dump() was incorrectly setting VPMU_CONTEXT_LOADED when it
was intending to check for it.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
This would have been avoided if the dump function declared all its
pointers "const" - doing this now (also in SVM).

Also fixing some indentation issues at once.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>