Break out two more items explicitly from the old 'proc locking' entry:

• Proc locking for debugging interfaces and procfs
• Proc locking for monitoring sysctls, such as those used by 'ps'

Since jhb has patches that cover this, I'll assign them to him for now.
Hopefully they're on the commit fast path, and we can remove these
RSN. I'm attempting to remove the 'proc locking' task item, since it's
sufficiently broad as to not be very instructive for those reading the
task list.