artik05x: modify ota header size
artik05x: modify ota header size

Change-Id: I46d7afcb96f07e47b8031d2406a34c88d72873c0
Signed-off-by: Junhwan Park <7fee488b6f78fc50b291ffc7d10428788977e877@samsung.com>

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