rockchip: rk3399: orangepi: Add SPL_TEXT_BASE

CONFIG_SPL_TEXT_BASE was available in configs/rk3399_common.h
when the OrangePI rk3399 board supported during first
version patch.

But, later below change which move this config into Kconfig and
same has been merged in mainline tree.
"configs: move CONFIG_SPL_TEXT_BASE to Kconfig"
(sha1: f89d6133)

Unfortunately, the maintainer applied the initial version patch,
instead of looking for next version changes.

Fix it by adding SPL_TEXT_BASE in orangepi-rk3399 defconfig.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>