staging/android: remove Sync Framework tasks from TODO

The destaging work is now fully complete.

Cc: Arve Hjønnevåg <[e-mail]>
Cc: Riley Andrews <[e-mail]>
Signed-off-by: Gustavo Padovan <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/android/TODO

···
    exposes existing cma regions and doesn't reserve unecessarily memory when
    booting a system which doesn't use ion.
 
-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 it to drivers/base/dma-buf
-
 Please send patches to Greg Kroah-Hartman <[e-mail]> and Cc:
 Arve Hjønnevåg <[e-mail]> and Riley Andrews <[e-mail]>