dm: Fix typo 'Watchdot' -> 'Watchdog'

Signed-off-by: Chris Packham <judge.packham@gmail.com>
diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h
index f3bafb3..86e5978 100644
--- a/include/dm/uclass-id.h
+++ b/include/dm/uclass-id.h
@@ -106,7 +106,7 @@
 	UCLASS_VIRTIO,		/* VirtIO transport device */
 	UCLASS_W1,		/* Dallas 1-Wire bus */
 	UCLASS_W1_EEPROM,	/* one-wire EEPROMs */
-	UCLASS_WDT,		/* Watchdot Timer driver */
+	UCLASS_WDT,		/* Watchdog Timer driver */
 
 	UCLASS_COUNT,
 	UCLASS_INVALID = -1,