Switch to unified app build system

xbin.mk has been rolled into trusted_app.mk. Switch to using the new
trusted_app.mk instead of xbin, using the function provided but
user-tasks.mk.

Test: build.py qemu-generic-arm64-test-debug
Bug: 169448829
Change-Id: I40055ef4dcaf54dfb1fc51436af5290581f2dc8c
2 files changed
tree: 0b60417b43503c5aca974151e944902e5da19bf0
  1. interface/
  2. ql-tipc/
  3. test-runner/
  4. .clang-format
  5. PREUPLOAD.cfg