Build: Update app_broker build

Update app_broker build to make dependencies more stable.

  - Sort NS library folder structure.
    Move common library folders out of app_broker. Place them under lib
    folder. Move CMSIS to lib/ext.
    It is expected that users can re-use those library in other NS
    integration with TF-M.
  - NS libraries depend on each other and therefore the dependencies are
    complicated. Build those NS libraries under app_broker to more
    easily sort out dependencies. Remove build files from library
    folders.

Signed-off-by: David Hu <david.hu@arm.com>
Change-Id: I8c2ff7bbec6c03738b9cbe49fd286a5147293ba5
66 files changed