Instead of pushing new synchronous transactions
to the process waitqueue, select a thread that is
waiting on proc work to handle the transaction.
This will make it easier to do proper priority
inheritance.
If we can't find a waiting thread, submit the work
to the proc waitqueue instead as we did previously.
Change-Id: Ib9385ba2c3e8b1e6d2106f1fce5b60bb117ec308
Signed-off-by: Martijn Coenen <maco@google.com>
47747abe74