Update platformio.ini

Author: Jason2866

examples/arduino-blink/platformio.ini

@@ -31,7 +31,6 @@ platform = espressif32
 framework = arduino
 board = esp32-c2-devkitm-1
 monitor_speed = 115200
-custom_sdkconfig        = 'CONFIG_IDF_TARGET="esp32c2"'
 custom_component_remove = espressif/esp_hosted
                           espressif/esp_wifi_remote
                           espressif/esp-dsp