unisys: replace kthread_create and wake_up_process with kthread_run

kthread_run calls kthread_create and if the thread is created
it then calls wake_up_process on the corresponding returned
task struct. So the code can be simplified by calling just
kthread_run.

Cc: Ken Cox <jkc@redhat.com>
Cc: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Devendra Naga <devendra.aaru@gmail.com>
Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>