KVM: SVM: Add helper to deduplicate code for getting AVIC backing page

KVM: SVM: Add helper to deduplicate code for getting AVIC backing page

Add a helper to get the physical address of the AVIC backing page, both
to deduplicate code and to prepare for getting the address directly from
apic->regs, at which point it won't be all that obvious that the address
in question is what SVM calls the AVIC backing page.

No functional change intended.

Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Tested-by: Sairaj Kodilkar <sarunkod@amd.com>
Reviewed-by: Naveen N Rao (AMD) <naveen@kernel.org>
Link: https://lore.kernel.org/r/20250611224604.313496-12-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>