arm64: dts: qcom: qcm6490-shift-otter: Enable flash LED

arm64: dts: qcom: qcm6490-shift-otter: Enable flash LED

Describe the flash LED on this phone.

Signed-off-by: Casey Connolly <casey.connolly@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: Luca Weiss <luca.weiss@fairphone.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Reviewed-by: Pavel Machek <pavel@ucw.cz>
Link: https://lore.kernel.org/r/20251009-otter-further-bringup-v2-4-5bb2f4a02cea@fairphone.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>