add artik520s configuration
add artik520s configuration

This patch adds an artik520s.cfg file for artik520 lock
chip.

Change-Id: Ibb8474e329bc9134fd521a1896dc87439f17db3f
Signed-off-by: Chanho Park <8ec285a53e21b773fd914e03c50e1b6431bc9aa8@samsung.com>

SamsungARTIK/build-artik