Recovering lost code getting I2S pin mapping on ESP32 (#3210)

Co-authored-by: nfbot <[email protected]>

Author: MarP13

targets/ESP32/_common/DeviceMapping_common.cpp

@@ -61,6 +61,9 @@ int Esp32_GetMappedDevicePins(Esp32_MapDeviceType deviceType, int busIndex, int
             case DEV_TYPE_SDMMC:
                 return (int)Esp32_SDMMC_DevicePinMap[busIndex][pinIndex];
 #endif
+            case DEV_TYPE_I2S:
+                return (int)Esp32_I2S_DevicePinMap[busIndex][pinIndex];
+
             default:
                 break;
         };