iio: adc: sc27xx: Fine tune the scale calibration values

Small adjustment the scale calibration value for the sc2731,
use new name sc2731_[big|small]_scale_graph_calib, and remove
the origin [big|small]_scale_graph_calib struct for unused.

Fixes: 8ba0dbfd (iio: adc: sc27xx: Add ADC scale calibration)
Signed-off-by: Cixi Geng <cixi.geng1@unisoc.com>
Link: https://lore.kernel.org/r/20220419142458.884933-4-gengcixi@gmail.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/sc27xx_adc.c

@@ -103,14 +103,14 @@ static struct sc27xx_adc_linear_graph small_scale_graph = {
 	100, 341,
 };
 
-static const struct sc27xx_adc_linear_graph big_scale_graph_calib = {
-	4200, 856,
-	3600, 733,
+static const struct sc27xx_adc_linear_graph sc2731_big_scale_graph_calib = {
+	4200, 850,
+	3600, 728,
 };
 
-static const struct sc27xx_adc_linear_graph small_scale_graph_calib = {
-	1000, 833,
-	100, 80,
+static const struct sc27xx_adc_linear_graph sc2731_small_scale_graph_calib = {
+	1000, 838,
+	100, 84,
 };
 
 static int sc27xx_adc_get_calib_data(u32 calib_data, int calib_adc)
@@ -130,11 +130,11 @@ static int sc27xx_adc_scale_calibration(struct sc27xx_adc_data *data,
 	size_t len;
 
 	if (big_scale) {
-		calib_graph = &big_scale_graph_calib;
+		calib_graph = &sc2731_big_scale_graph_calib;
 		graph = &big_scale_graph;
 		cell_name = "big_scale_calib";
 	} else {
-		calib_graph = &small_scale_graph_calib;
+		calib_graph = &sc2731_small_scale_graph_calib;
 		graph = &small_scale_graph;
 		cell_name = "small_scale_calib";
 	}