MINOR: debug: remove mask support from "debug dev sched"

The thread mask will not be used anymore, instead the thread id only
is used. Interestingly it was already implemented in the parsing but
not used. The single/multi thread argument is not needed anymore since
it's sufficient to pass tid<0 to get a multi-threaded task/tasklet.

This is in preparation for the removal of the thread_mask in tasks as
only this debug code was using it!
1 file changed