KVM: arm64: Handle stage-1 permission overlays

We now have the intrastructure in place to emulate S1POE:

- direct permissions are always overlay-capable
- indirect permissions are overlay-capable if the permissions are
  in the 0b0xxx range
- the overlays are strictly substractive

Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20241023145345.1613824-37-maz@kernel.org


Signed-off-by: Oliver Upton <oliver.upton@linux.dev>