Gallery2: support the newly added media file types in MTP mode
am: 6669f2c

* commit '6669f2c4e92da4ee45c0d23ebee38a2cf0e7f539':
  Gallery2: support the newly added media file types in MTP mode

Change-Id: Ib6f60b182d9b6c369bae034d2bffdafb933b6c21