artik5: config: update env offset
artik5: config: update env offset

This patch updates u-boot env offset according to
changed 1MB tzsw partition.

Change-Id: Ic8711b9477ea8436a94bbd038c6e5aed82533f68
Signed-off-by: Chanho Park <8ec285a53e21b773fd914e03c50e1b6431bc9aa8@samsung.com>

SamsungARTIK/build-artik