iio: adc: at91-sama5d2_adc: get rid of 5 degrees Celsius adjustment

On SAMA7G5 final chip version there is no need for 5 degrees Celsius
adjustment when computing junction temperature, thus, remove it.

Fixes: 5ab38b8189 ("iio: adc: at91-sama5d2_adc: add support for temperature sensor")
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20221020102705.3639204-1-claudiu.beznea@microchip.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/at91-sama5d2_adc.c

@@ -2307,11 +2307,9 @@ static int at91_adc_temp_sensor_init(struct at91_adc_state *st,
 	clb->p6 = buf[AT91_ADC_TS_CLB_IDX_P6];
 
 	/*
-	 * We prepare here the conversion to milli and also add constant
-	 * factor (5 degrees Celsius) to p1 here to avoid doing it on
-	 * hotpath.
+	 * We prepare here the conversion to milli to avoid doing it on hotpath.
 	 */
-	clb->p1 = clb->p1 * 1000 + 5000;
+	clb->p1 = clb->p1 * 1000;
 
 free_buf:
 	kfree(buf);