dt-bindings: clock: mediatek: Convert MediaTek clock syscons to schema

Convert the various MediaTek syscon bindings which are a clock provider
into DT schema format. As they are all the same other than compatible
string, combine them into a single schema file.

Signed-off-by: Rob Herring (Arm) <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Acked-by: Conor Dooley <[email protected]>
Signed-off-by: Stephen Boyd <[email protected]>

Author: robherring