arm: Add Hypervisor.framework build target

arm: Add Hypervisor.framework build target

Now that we have all logic in place that we need to handle Hypervisor.framework
on Apple Silicon systems, let's add CONFIG_HVF for aarch64 as well so that we
can build it.

Signed-off-by: Alexander Graf <[email protected]>
Reviewed-by: Roman Bolshakov <[email protected]>
Tested-by: Roman Bolshakov <[email protected]> (x86 only)
Reviewed-by: Peter Maydell <[email protected]>
Reviewed-by: Sergio Lopez <[email protected]>
Message-id: 20210916155404[email protected]
Signed-off-by: Peter Maydell <[email protected]>