Add binding documentation for topckgen, apmixedsys, infracfg, audsys,
imgsys, mfgcfg, vdecsys on MT8167 SoC.

Signed-off-by: Fabien Parent <fparent@baylibre.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20200918132303.2831815-1-fparent@baylibre.com


Signed-off-by: Stephen Boyd <sboyd@kernel.org>