dt-bindings: clock: ti: Convert composite.txt to json-schema

Convert the OMAP gate clock device tree binding to json-schema.
Specify the creator of the original binding as a maintainer.
Choose GPL-only license because original binding was also GPL.

Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Link: https://lore.kernel.org/r/20250105170854.408875-3-andreas@kemnade.info


Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>