Also add libfstab dependencies where needed. Previously the
`typedef struct FstabEntry Volume;` line served to both define a
`struct FstabEntry` as well as alias Volume to it. With the new
namespace for android::fs_mgr::FstabEntry, `struct FstabEntry` isn't
compatible anymore, so we need to alias Volume to the real
android::fs_mgr::FstabEntry.
In doing so, we need to include <fstab/fstab.h> and this requires
libfstab as a library, which a few modules did not have before.
Test: treehugger
Change-Id: I655209a0efb304b3e0568db0748bd5cf7cecbdb7
72a114a3e1