The A80 includes an ARM CCI-400 interconnect to support multi-cluster
CPU caches.

Also add the maximum clock frequency for the CPUs, as listed in the
A80 Optimus Board FEX file.
Acked-by: NMaxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: NChen-Yu Tsai <wens@csie.org>