KVM: arm64: nv: Extract translation helper from the AT code

The address translation infrastructure is currently pretty tied to
the AT emulation.

However, we also need to features that require the use of VAs, such
as VNCR_EL2 (and maybe one of these days SPE), meaning that we need
a slightly more generic infrastructure.

Start this by introducing a new helper (__kvm_translate_va()) that
performs a S1 walk for a given translation regime, EL and PAN
settings.

Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20250514103501.2225951-4-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>

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