KVM: x86: fix APIC page invalidation

KVM: x86: fix APIC page invalidation

Implementation of the unpinned APIC page didn't update the VMCS address
cache when invalidation was done through range mmu notifiers.
This became a problem when the page notifier was removed.

Re-introduce the arch-specific helper and call it from ...range_start.

Reported-by: Fabian Grünbichler <[email protected]>
Fixes: 38b9917350cb ("kvm: vmx: Implement set_apic_access_page_addr")
Fixes: 369ea8242c0f ("mm/rmap: update to new mmu_notifier semantic v2")
Cc: <[email protected]>
Reviewed-by: Paolo Bonzini <[email protected]>
Reviewed-by: Andrea Arcangeli <[email protected]>
Tested-by: Wanpeng Li <[email protected]>
Tested-by: Fabian Grünbichler <[email protected]>
Signed-off-by: Radim Krčmář <[email protected]>