adc: ignore ADC DMA single read test on esp32s2

This test is only on esp32s2, and using verification adc APIs.
This commit keeps the code, but don't check it on ci

components/driver/test/adc_dma_test/test_esp32s2.c

@@ -452,7 +452,7 @@ int test_adc_dig_dma_single_unit(adc_unit_t adc)
     return 0;
 }
 
-TEST_CASE("ADC DMA single read", "[ADC]")
+TEST_CASE("ADC DMA single read", "[ADC][ignore]")
 {
     test_adc_dig_dma_single_unit(ADC_UNIT_BOTH);