dt-bindings: memory: mtk-smi: Correct minItems to 2 for the gals clocks

Mute the warning from "make dtbs_check":

larb@14017000: clock-names: ['apb', 'smi'] is too short
	arch/arm64/boot/dts/mediatek/mt8183-evb.dt.yaml
	arch/arm64/boot/dts/mediatek/mt8183-kukui-jacuzzi-burnet.dt.yaml
	...

larb@16010000: clock-names: ['apb', 'smi'] is too short
	arch/arm64/boot/dts/mediatek/mt8183-evb.dt.yaml
	arch/arm64/boot/dts/mediatek/mt8183-kukui-jacuzzi-burnet.dt.yaml

larb@17010000: clock-names: ['apb', 'smi'] is too short
	arch/arm64/boot/dts/mediatek/mt8183-evb.dt.yaml
	arch/arm64/boot/dts/mediatek/mt8183-kukui-jacuzzi-burnet.dt.yaml

If a platform's larb supports gals, there will be some larbs have one
more "gals" clock while the others still only need "apb"/"smi" clocks,
then the minItems for clocks and clock-names are 2.

Fixes: 27bb0e42 ("dt-bindings: memory: mediatek: Convert SMI to DT schema")
Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220113111057.29918-4-yong.wu@mediatek.com


Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>