Revises the microkernel footprint benchmark sample projects to take
advantage of the NUM_TASK_PRIORITIES configuration option. Most
notably, this reduces the size of the minimum microkernel configuration
by over 500 bytes.
Change-Id: I2be1b0a5a09800559df4d1bf355de38d6c0b9ab3
Signed-off-by: Allan Stephens <allan.stephens@windriver.com>