Skip init for poweroff after flashing from sdcard.

Change-Id: Ib17dba4f8ee48a532c93baf50e84b509081da8f0
diff --git a/flashcard/init b/flashcard/init
index 7e58a9f..5d6e86e 100755
--- a/flashcard/init
+++ b/flashcard/init
@@ -63,6 +63,5 @@
 log "==============================================================="
 log
 log "Board will power down in 10 seconds..."
-sleep 10
-poweroff
-sleep 100000
+poweroff -d 10 -f
+