staging/android: add TODO to de-stage android sync framework

 - remove CONFIG_SW_SYNC_USER, it is used only for testing/debugging and
   should not be upstreamed.
 - port CONFIG_SW_SYNC_USER tests interfaces to use debugfs somehow
 - port libsync tests to kselftest
 - clean up and ABI check for security issues
 - move the sync framework to drivers/base/dma-buf

Cc: Arve Hjønnevåg <arve@android.com>
Cc: Riley Andrews <riandrews@android.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Rob Clark <robdclark@gmail.com>
Cc: Greg Hackmann <ghackmann@google.com>
Cc: John Harrison <John.C.Harrison@Intel.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>