esp_adc: add a kconfig to disable dac on certain adc IOs

Added a kconfig option. By default, when using ADC oneshot
driver, it will disable
DAC channels:
- ESP32:   IO25, IO26
- ESP32S2: IO17, IO18
if ADC2 is in use.

You can disable this option, to measure DAC output, via internal ADC.
This is for test usage.

components/esp_adc/Kconfig

@@ -41,7 +41,19 @@ menu "ADC and ADC Calibration"
                 This option will allow the ADC calibration component to use Lookup Tables
                 to correct for non-linear behavior in 11db attenuation. Other attenuations
                 do not exhibit non-linear behavior hence will not be affected by this option.
-
     endmenu
 
+    config ADC_DISABLE_DAC_OUTPUT
+        depends on SOC_DAC_SUPPORTED
+        bool "Disable DAC when ADC2 is in use"
+        default y
+        help
+            By default, this is set. The ADC oneshot driver will disable the output of the
+            corresponding DAC channels:
+            ESP32:   IO25 and IO26
+            ESP32S2: IO17 and IO18
+
+            Disable this option so as to measure the output of DAC by internal ADC, for test usage.
+
+
 endmenu

components/hal/adc_oneshot_hal.c

@@ -25,7 +25,7 @@
 #endif
 
 
-#if SOC_DAC_SUPPORTED
+#if CONFIG_ADC_DISABLE_DAC_OUTPUT
 // To disable DAC, workarounds, see this function body to know more
 static void s_disable_dac(adc_oneshot_hal_ctx_t *hal, adc_channel_t channel);
 #endif
@@ -52,7 +52,7 @@ void adc_oneshot_hal_setup(adc_oneshot_hal_ctx_t *hal, adc_channel_t chan)
     adc_ll_amp_disable();  //Currently the LNA is not open, close it by default.
 #endif
 
-#if SOC_DAC_SUPPORTED
+#if CONFIG_ADC_DISABLE_DAC_OUTPUT
     s_disable_dac(hal, chan);
 #endif
 
@@ -144,7 +144,7 @@ bool adc_oneshot_hal_convert(adc_oneshot_hal_ctx_t *hal, int *out_raw)
 /*---------------------------------------------------------------
                     Workarounds
 ---------------------------------------------------------------*/
-#if SOC_DAC_SUPPORTED
+#if CONFIG_ADC_DISABLE_DAC_OUTPUT
 static void s_disable_dac(adc_oneshot_hal_ctx_t *hal, adc_channel_t channel)
 {
     /**