Remove unnecessary sample project use of CONTEXT_MONITOR

Revises boot time benchmarking project so it doesn't utilize the
CONTEXT_MONITOR capabililty, which is still [EXPERIMENTAL] and thus
could result in potentially misleading results.

Revises ARM M3/4 ISR installation project, which doesn't actual
require the CONTEXT_MONITOR capability.

Change-Id: I45d2abe85a0049b0c745652d2e78210c9696016d
Signed-off-by: Allan Stephens <allan.stephens@windriver.com>