KVM: arm64: nv: Snapshot S1 ASID tagging information during walk

We currently completely ignore any sort of ASID tagging during a S1
walk, as AT doesn't care about it.

However, such information is required if we are going to create
anything that looks like a TLB from this walk.

Let's capture it both the nG and ASID information while walking
the page tables.

Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20250514103501.2225951-5-maz@kernel.org


Signed-off-by: Marc Zyngier <maz@kernel.org>