Move AIDL files to declared packages.

There was a regression in the AIDL compiler recently that removed the
requirement that, like in Java, .aidl unstructured parcelables (these
parcelable declarations) are in directories and files which match their
packages and file names. This CL moves relevant files to the correct
directory required by their type.

Bug: N/A
Test: build
Change-Id: I71f6f714e98e184a02b6bbf3d4f8b0b8c8aee30b