dt-bindings: clock: gpio-gate-clock: Convert to json-schema

Convert the simple GPIO clock gate Device Tree binding to json-schema
and fix-up references to this file in other text format bindings.
Jyri Sarha is the file's only editor/author so they have been added as
maintainer of the new yaml binding.

Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20220727131015.2073100-1-conor.dooley@microchip.com


Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>