eNET: Implement eNET Watchdog

Signed-off-by: Graeme Russ <graeme.russ@gmail.com>
diff --git a/board/eNET/hardware.h b/board/eNET/hardware.h
index 42474a6..dec2cd8 100644
--- a/board/eNET/hardware.h
+++ b/board/eNET/hardware.h
@@ -31,5 +31,6 @@
 #define LED_RX_BITMASK		0x08
 #define LED_TX_BITMASK		0x10
 #define LED_ERR_BITMASK		0x20
+#define WATCHDOG_PIO_BIT	0x8000
 
 #endif /* HARDWARE_H_ */