KVM: arm64: nv: Handle VNCR_EL2 invalidation from MMU notifiers

During an invalidation triggered by an MMU notifier, we need to
make sure we can drop the *host* mapping that would have been
translated by the stage-2 mapping being invalidated.

For the moment, the invalidation is pretty brutal, as we nuke
the full IPA range, and therefore any VNCR_EL2 mapping.

At some point, we'll be more light-weight, and the code is able
to deal with something more targetted.

Reviewed-by: Oliver Upton <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Marc Zyngier <[email protected]>

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