--dumpapi with copyright/license headers

copyright/license headers should be included in snapshots.
With the change, newly created snapshots will have copyright/license
headers in each .aidl file.

* `m <name>-update-api` updates `current/` dump with copyright/license
headers.
* `m <name>-freeze-api` creates a new frozen dump with copyright/license
headers.

The change contains the updated `current/` dumps of aidl_interface
modules in /system/tools/aidl.

Bug: 172476424
Test: mmma system/toosl/aidl (checks if there's mismatch)
Change-Id: I2170c61ce7770a26bf6d9fdc9689842a38026b8d
18 files changed