tests/adc_api: add parameters for mec15xxevb_assy6853

This adds the parameters needed to get the test to build
and to run.

Signed-off-by: Daniel Leung <daniel.leung@intel.com>

tests/drivers/adc/adc_api/src/test_adc.c

@@ -163,6 +163,15 @@
 #define ADC_1ST_CHANNEL_ID	0
 #define ADC_2ND_CHANNEL_ID	1
 
+#elif defined(CONFIG_BOARD_MEC15XXEVB_ASSY6853)
+#define ADC_DEVICE_NAME		DT_ADC_0_NAME
+#define ADC_RESOLUTION		12
+#define ADC_GAIN		ADC_GAIN_1
+#define ADC_REFERENCE		ADC_REF_INTERNAL
+#define ADC_ACQUISITION_TIME	ADC_ACQ_TIME_DEFAULT
+#define ADC_1ST_CHANNEL_ID	4
+#define ADC_2ND_CHANNEL_ID	5
+
 #else
 #error "Unsupported board."
 #endif