Solve the problem that usb does not save the log

output/board/ark1668e_c281/buildroot/target/opt/usb/mountusb.sh

@@ -6,8 +6,10 @@ sync
 
 if [ ! -d "/mnt/usb/logs" ]; then
         cp -rf /usr/log/logs /mnt/usb/
+	sync
 fi
 
 if [ -f "/mnt/usb/awtk_update/update.sh" ]; then
         /mnt/usb/awtk_update/update.sh
-fi
+	sync
+fi