adc_hal_get_reading_result() function

Context of the HAL

The last descriptor that is finished by HW. Should be got from DMA

ADC reading result buffer

ADC reading result len

Initialize the HW

Initialize the hal context

Setting the digital controller.

Link DMA descriptor

For esp32s2 and later chips - Set ADC digital controller clock division factor. The clock is divided from `APLL` or `APB` clock. Expression: controller_clk = APLL/APB * (div_num + div_a / div_b + 1). - Enable clock and select clock source for ADC digital controller. For esp32, use I2S clock