dt-bindings: ARM: Mediatek: Add mmsys document binding for MT8192

This patch adds the mmsys document binding for MT8192 SoC.

Signed-off-by: Chun-Jie Chen <[e-mail]>
Reviewed-by: Chun-Kuang Hu <[e-mail]>
Reviewed-by: Matthias Brugger <[e-mail]>
Acked-by: Rob Herring <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Stephen Boyd <[e-mail]>

Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.txt

···
 	- "mediatek,mt8167-mmsys", "syscon"
 	- "mediatek,mt8173-mmsys", "syscon"
 	- "mediatek,mt8183-mmsys", "syscon"
+	- "mediatek,mt8192-mmsys", "syscon"
 - #clock-cells: Must be 1
 
 For the clock control, the mmsys controller uses the common clk binding from