clk: mediatek: Add dt-bindings of MT8192 clocks

Add MT8192 clock dt-bindings, include topckgen, apmixedsys,
infracfg, pericfg and subsystem clocks.

Signed-off-by: Weiyi Lu <weiyi.lu@mediatek.com>
Signed-off-by: Chun-Jie Chen <chun-jie.chen@mediatek.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210726105719.15793-5-chun-jie.chen@mediatek.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>