KVM: nSVM: Add CLASS()es for automagically handling local kvm_vcpu_map() usage

Add CLASS() definitions for locally mapping a PFN using kvm_vcpu_map()
given a vCPU+gfn pair.  In addition to eliminating the need to manually
do unmap(), e.g. in error paths, this will allow hardening KVM against
double-mapping without having to manually ensure every on-stack declaration
is zero-initialized.

Use "map local" as the primary terminology as the basic concept is more or
less the same as kmap_local(): ensure the current context has a kernel
mapping to the underlying memory.

Immediately convert the relatively straightforward nested SVM flows, and
defer converting the more involved SMM flows to a separate change.

No functional change intended.

Cc: Yosry Ahmed <yosry@kernel.org>
Link: https://patch.msgid.link/20260724004757.131420-3-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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