make: aidl: Add explicit dependency on the aidl binary am: 39756c7379

Original change: https://android-review.googlesource.com/c/trusty/lib/+/3449400

Change-Id: Ica3944ff60954362e574c5b74a1f671bd97bc1ad
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>