config:trats2: Change u-boot's TEXT_BASE from 0x78100000 to 0x43e00000

The u-boot's image TEXT_BASE needs to be changed to 0x43e00000 from 0x78100000.

This change provides compatibility with other trats2 (RD_PQ) devices
(http://download.tizen.org/releases/system/

).

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>