am 09a00a67: Don\'t build update zip package if there is no kernel, or it\'s generic device.

Merge commit '09a00a672bb18dccc97af6090739ea275c39d8a3' into gingerbread-plus-aosp

* commit '09a00a672bb18dccc97af6090739ea275c39d8a3':
  Don't build update zip package if there is no kernel, or it's generic device.