clock_pll
int clock_pll (int fsys, int flags);
clock_pll(0, 0);
u16 clock_pll;
clock_pll = osc_calibrate_val & VL53L1X_OSC_CALIBRATE_MASK;
inter_meas = (clock_pll * period_ms * vl53l1x_osc_correction.numerator) /