Fix Wmissing-field-initializers in external/mmc-utils. am: 358f4f5 am: 5dc7ade
am: 6de31b2

* commit '6de31b2b8a09108f9b91bc12bee2b792f783dc62':
  Fix Wmissing-field-initializers in external/mmc-utils.

Change-Id: I37ba8d842925af8793284deb2be4f8b733858b18