KVM: arm64: Add filtering hook to S1 page table walk

KVM: arm64: Add filtering hook to S1 page table walk

Add a filtering hook that can get called on each level of the
walk, and providing access to the full state.

Crucially, this is called *before* the access is made, so that
it is possible to track down the level of a faulting access.

Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>