arm64: dts: amlogic: g12a-u200: drop invalid sound-dai-cells

This fixes the following:
audio-amplifier-0: '#sound-dai-cells' does not match any of the regexes: 'pinctrl-[0-9]+'

Tested-by: Christian Hewitt <christianshewitt@gmail.com>
Link: https://lore.kernel.org/r/20240606-topic-amlogic-upstream-bindings-fixes-dts-v1-6-62e812729541@linaro.org


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