power-domain.h: Fix typo

%s/ot/to/

Signed-off-by: Anatolij Gustschin <agust@denx.de>
diff --git a/include/power-domain.h b/include/power-domain.h
index 0099605..0737070 100644
--- a/include/power-domain.h
+++ b/include/power-domain.h
@@ -151,7 +151,7 @@
 #endif
 
 /**
- * power_domain_off - Disable power ot a power domain.
+ * power_domain_off - Disable power to a power domain.
  *
  * @power_domain:	A power domain struct that was previously successfully
  *		requested by power_domain_get().