KVM/arm64 fixes for 6.9, part #1

 - Ensure perf events programmed to count during guest execution
   are actually enabled before entering the guest in the nVHE
   configuration.

 - Restore out-of-range handler for stage-2 translation faults.

 - Several fixes to stage-2 TLB invalidations to avoid stale
   translations, possibly including partial walk caches.

 - Fix early handling of architectural VHE-only systems to ensure E2H is
   appropriately set.

 - Correct a format specifier warning in the arch_timer selftest.

 - Make the KVM banner message correctly handle all of the possible
   configurations.
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