artik053: update bl2 image
artik053: update bl2 image

We changed the SRAM size of u-boot to the current artik05x.

Change-Id: I51613a68c1a729fc458011f1e252d2dbabcedb07
Signed-off-by: Junhwan Park <7fee488b6f78fc50b291ffc7d10428788977e877@samsung.com>

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