arm64: dts: amlogic: meson-g12b-odroid-go-ultra: fix rk818 pmic properties

Fixes:
pmic@1c: '#clock-cells' is a required property
pmic@1c: 'switch-supply' does not match any of the regexes: 'pinctrl-[0-9]+'

The switch supply is described by vcc9-supply per bindings documentation.

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