dt-bindings: soc: mediatek: specify which compatible requires clocks property

According to the mtk-mutex.c driver and the SoC DTS, the clock isn't
required to work properly for some of MTK SoC. Improve the clock
requirement by adding a condition which is function to the compatible.

Signed-off-by: Alexandre Mergnat <amergnat@baylibre.com>
Link: https://lore.kernel.org/r/20230220-display-v1-14-45cbc68e188b@baylibre.com


Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>