iio: adc: move vadc_map_pt from header to the source file

struct vadc_map_pt is not used outside of qcom-vadc-common.c, so move it
there from the global header file.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20201204025509.1075506-9-dmitry.baryshkov@linaro.orgSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/qcom-vadc-common.c

@@ -10,6 +10,17 @@
 #include <linux/module.h>
 #include <linux/units.h>
 
+/**
+ * struct vadc_map_pt - Map the graph representation for ADC channel
+ * @x: Represent the ADC digitized code.
+ * @y: Represent the physical data which can be temperature, voltage,
+ *     resistance.
+ */
+struct vadc_map_pt {
+	s32 x;
+	s32 y;
+};
+
 /* Voltage to temperature */
 static const struct vadc_map_pt adcmap_100k_104ef_104fb[] = {
 	{1758,	-40},

include/linux/iio/adc/qcom-vadc-common.h

@@ -59,17 +59,6 @@
 #define DIE_TEMP_ADC7_SCALE_FACTOR		1000
 #define DIE_TEMP_ADC7_MAX			160000
 
-/**
- * struct vadc_map_pt - Map the graph representation for ADC channel
- * @x: Represent the ADC digitized code.
- * @y: Represent the physical data which can be temperature, voltage,
- *     resistance.
- */
-struct vadc_map_pt {
-	s32 x;
-	s32 y;
-};
-
 /*
  * VADC_CALIB_ABSOLUTE: uses the 625mV and 1.25V as reference channels.
  * VADC_CALIB_RATIOMETRIC: uses the reference voltage (1.8V) and GND for