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

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) <[email protected]>
Reviewed-by: Martin Blumenstingl <[email protected]>
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 <[email protected]>

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