ARM: dts: amlogic: meson6: fix clk81 node name

ARM: dts: amlogic: meson6: fix clk81 node name

Use the proper node name, fixing:
arch/arm/boot/dts/amlogic/meson6-atv1200.dtb: /: clk@0: 'anyOf' conditional failed, one must be fixed:
	'reg' is a required property
	'ranges' is a required property
	from schema $id: http://devicetree.org/schemas/root-node.yaml#

Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Link: https://lore.kernel.org/r/20240916-topic-amlogic-arm32-upstream-bindings-fixes-v2-1-0b20ed4f0571@linaro.org
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>