Add external/spdx-tools to manifest

Required to extend the Soong, Make and Bazel build systems with SBOM support

BUG: 254467346
Change-Id: I6dcf301e49202b6da2bbb12d9a6051419ddf59cb
1 file changed
tree: 93d6cc17d49e2a8c976547700a86691f3f82713c
  1. default.xml
  2. GLOBAL-PREUPLOAD.cfg
  3. OWNERS