adc_cali_scheme_t struct

Convert ADC raw data to calibrated voltage

Create a Line Fitting calibration scheme After creating, you'll get a handle to this scheme. Then you can use the driver APIS in `esp_adc/adc_cali.h` to do the ADC calibration via the handle you get.

Delete the Line Fitting calibration scheme handle

Convenience function to get ADC calibrated result This is an all-in-one function which does: - oneshot read ADC raw result - calibrate the raw result and convert it into calibrated result (in mV)