feat(xiao esp32c5): Add definitions for battery voltage sampling pin and enable pin (espressif#12086)

* feat(xiao esp32c5): Add definitions for the battery voltage sampling pin and the enable pin

* Modify pin definition name

Co-authored-by: Jan Procházka <90197375+P-R-O-C-H-Y@users.noreply.github.com>

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Co-authored-by: Jan Procházka <90197375+P-R-O-C-H-Y@users.noreply.github.com>

Author: Lee-Stone

variants/XIAO_ESP32C5/pins_arduino.h

@@ -39,4 +39,7 @@ static const uint8_t D8 = 8;
 static const uint8_t D9 = 9;
 static const uint8_t D10 = 10;
 
+static const uint8_t BAT_VOLT_PIN = 6;
+static const uint8_t BAT_VOLT_PIN_EN = 26;
+
 #endif /* Pins_Arduino_h */