arm64: dts: qcom: correct SPMI WLED register range encoding

On PM660L, PMI8994 and PMI8998, the WLED has two address spaces and with
size-cells=0, they should be encoded as two separate items.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220505154702.422108-2-krzysztof.kozlowski@linaro.org