arm64: dts: qcom: apq8016-sbc: Fix LED's naming

96Boards CE specs uses user 0, 1, 2, 3 and WIFI for LED's naming.
Fix implementation to match specification.

Signed-off-by: Ivan T. Ivanov <ivan.ivanov@linaro.org>
Signed-off-by: Nicolas Dechesne <nicolas.dechesne@linaro.org>