kernel: Add interrupt locking to thread monitoring exit API

This is needed because some thread termination paths can be
invoked with no guarantee that thread preemption won't happen.
(It also aligns with the approach taken by the thread monitoring
initialization code.)

Change-Id: I28a384e051775390eb047498cb23fed22910e4df
Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
2 files changed