Add device tree documentation for the main clock controller in the
Artpec-6 SoC.
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NLars Persson <larper@axis.com>
[sboyd@codeaurora.org: Added unit address to binding example]
Signed-off-by: NStephen Boyd <sboyd@codeaurora.org>