KVM: SVM: Track AVIC tables as natively sized pointers, not "struct pages"

KVM: SVM: Track AVIC tables as natively sized pointers, not "struct pages"

Allocate and track AVIC's logical and physical tables as u32 and u64
pointers respectively, as managing the pages as "struct page" pointers
adds an almost absurd amount of boilerplate and complexity.  E.g. with
page_address() out of the way, svm->avic_physical_id_cache becomes
completely superfluous, and will be removed in a future cleanup.

No functional change intended.

Tested-by: Sairaj Kodilkar <sarunkod@amd.com>
Acked-by: Naveen N Rao (AMD) <naveen@kernel.org>
Link: https://lore.kernel.org/r/20250611224604.313496-16-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>