dt-bindings: mediatek: bindings for MT6779 clk

This patch adds the binding documentation for
apmixedsys, audiosys, camsys, imgsys, ipesys,
infracfg, mfgcfg, mmsys, topckgen, vdecsys,
and vencsys for Mediatek MT6779.

Signed-off-by: mtk01761 <wendell.lin@mediatek.com>
Link: https://lkml.kernel.org/r/1566206502-4347-9-git-send-email-mars.cheng@mediatek.com


Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>