Add tz-ppc-dummy mmio read/write methods to avoid assert failure
during initialisation.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Reviewed-by: Li Qiang <liq3ea@gmail.com>
Message-Id: <20200811114133.672647-8-ppandit@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>