Add one `android_library` module in Soong

In order to pass the `test/mlts/models/assets` as asset_dirs to other
modules not locating in this directory,
1. one`android_library` modlule was added;
2. one necessary AndroidManifest.xml file was added as well;

Bug: 191056094
Test: compared the built results by Make and Soong
Test: TreeHugger
Change-Id: I4c104678b94b32d8c1b4636d9b254a5fbc77957d
Merged-In: I4c104678b94b32d8c1b4636d9b254a5fbc77957d
2 files changed
tree: 02295b0623a30e2e3f7b4dbe1a315d35c790b8cc
  1. assets/
  2. Android.bp
  3. AndroidManifest.xml
  4. LICENSE
  5. OWNERS
  6. README.txt