KVM: arm64: vgic-its: Scope translation cache invalidations to an ITS

As the current LPI translation cache is global, the corresponding
invalidation helpers are also globally-scoped. In anticipation of
constructing a translation cache per ITS, add a helper for scoped cache
invalidations.

We still need to support global invalidations when LPIs are toggled on
a redistributor, as a property of the translation cache is that all
stored LPIs are known to be delieverable.

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

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