Android n preview 1
Remove obsolete conditional

Now in unbundled or PDK build we use prebuilt aidl in place.
We don't need the conditional any more.
Also this expose aidl-cpp to pseudo unbundled build in the platform
source tree.

Bug: 27488208
Change-Id: I2c16700e764e2de410ea579b975e11a0d56429c2
(cherry-pick from commit 6215b9569ff2056b78893ce9a5007d419ef203f5)
1 file changed