dt-bindings: soc: amlogic,meson-gx-hhi-sysctrl: Document the System Control...

dt-bindings: soc: amlogic,meson-gx-hhi-sysctrl: Document the System Control registers found on early Meson SoC

The early Amlogic SoCs also has a System Control registers register set,
document it in the amlogic,meson-gx-hhi-sysctrl now the clock controller
has been converted to yaml dt-schema.

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Link: https://lore.kernel.org/r/20241007-topic-amlogic-arm32-upstream-bindings-fixes-hhi-sysctrl-meson8-v1-1-896b24e6c3c8@linaro.org


Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>