arm64: dts: qcom: qcm6490-idp: Add definition for three LEDs

Add definition for three LEDs to make sure they can
be enabled base on QCOM LPG LED driver.

Signed-off-by: Hui Liu <quic_huliu@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20240126-lpg-v6-1-f879cecbce69@quicinc.com


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