ARM: dts: qcom: msm8974-klte: Add support for led

The klte uses a Panasonic AN30259A LED controller for it's indicator
led.

Signed-off-by: Iskren Chernev <iskren.chernev@gmail.com>
Link: https://lore.kernel.org/r/20200920144859.813032-5-iskren.chernev@gmail.com


Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>