pm8xxx-adc: add the functions to set tuning parameters

We need to tune the board specific adcmap parameters
So need functions to set specific parameters.

void pm8xxx_set_adcmap_btm_threshold(void *pts, int size)
void pm8xxx_set_adcmap_pa_therm(void *pts, int size)
void pm8xxx_set_adcmap_ntcg_104ef_104fb(void *pts, int size)

Change-Id: Ie78c11f5fb998ecc456defa3c8e3e7a3e0b9b45f