arm: introduce a new board type for ARTIK-053S
arm: introduce a new board type for ARTIK-053S

ARTIK-053S is a variant of ARTIK-053. Unlike its predecessor, ARTIK-053S
provides various security features including secure storage. To
distinguish those boards, this commit adds a new Kconfig entry.

Change-Id: Idcf1bfda9c62e5103dcd26084f35d67972a5643b
Signed-off-by: Heesub Shin <45471ea77bd08f3d26635f3f5adb40ba41250a2b@samsung.com>

JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT