Now that runqueue optimises based on task hash, we need to ensure
tasks have unique hashes even in the simplest siggen mode. Use
the task name to calculate a unique hash.
This fixes runqueue tests when hash optimisations are added.
(Bitbake rev: 8ede873ef4ef492fbaf01474685c1ca8b34d80d5)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>