Heat oil in a large pan over medium-low heat. Add turmeric and cumin seeds; cook until seeds start crackling. Add kale and soaked dal, followed by chili powder and salt. Pour in 1/4 cup water; bring to a boil. Reduce heat back to medium-low and cover the pan. Cook, mixing every 5 minutes, until desired tenderness is reached, 10 to 20 minutes total.