/storage/emulated/legacy: removed directory creation.

The paths /mnt/shell/emulated/0 and /storage/emulated/legacy cannot
both be directories given the following:

    symlink /mnt/shell/emulated/0 /storage/emulated/legacy

occurs shortly after the (now) removed directive.

Change-Id: I0b8d99e0332cb944e988704c840eb82d4495e039