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The two HOST_{SVE,SME}_ENABLED are only used for the host kernel
to track its own state across a vcpu run so that it can be fully
restored.

Move these flags to the so called state set.
Reviewed-by: Fuad Tabba <tabba@google.com>
Reviewed-by: Reiji Watanabe <reijiw@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>