Previously, the cc3220sf platform could only be flashed using
TI UniFlash (or CCS) tools, requiring unique instructions.
Also, these procedures were not integrated with the standard Zephyr
build targets: 'flash', 'debug', 'debugserver'.
After installation of a TI OpenOCD v1.10 release, and other
one-time board setup, flashing and debugging can now be done
via OpenOCD/gdb, using the standard Zephyr build targets per
the Zephyr Application Development primer.
Signed-off-by: Gil Pitney <gil.pitney@linaro.org>