artik053/Kconfig: remove unnecessary if statement
artik053/Kconfig: remove unnecessary if statement

'artik053/Kconfig' is included only when ARCH_BOARD_ARTIK053 is set.
Thus, checking it seems redundant.

Change-Id: I90b5b8a57d041abf2b25d4e2deadbe245548febb
Signed-off-by: Heesub Shin <45471ea77bd08f3d26635f3f5adb40ba41250a2b@samsung.com>

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