am 4553b08d: sdcard: Implement statfs, stat time values and change mount point to /mnt/sdcard

Merge commit '4553b08d7555a103fdbe8623a9cbd826a7e413ff' into gingerbread-plus-aosp

* commit '4553b08d7555a103fdbe8623a9cbd826a7e413ff':
  sdcard: Implement statfs, stat time values and change mount point to /mnt/sdcard