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) <robh@kernel.org>
Link: https://lore.kernel.org/r/20240807-dt-mediatek-clk-v1-3-e8d568abfd48@kernel.org
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Author: robherring