To obtain lower power measurements in general, we should turn off the
external flash which is on by default at boot.
Code is modeled based on examples shipped in the TI SimpleLink SDK.
Signed-off-by: Vincent Wan <vincent.wan@linaro.org>
Adding an example that exercises the sleep modes, then powers off the
system by going into deep sleep.
Signed-off-by: Vincent Wan <vincent.wan@linaro.org>