Rename CONFIG_SYS_TEXT_BASE to CONFIG_TEXT_BASE

The current name is inconsistent with SPL which uses CONFIG_SPL_TEXT_BASE
and this makes it imposible to use CONFIG_VAL().

Rename it to resolve this problem.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/evb-rk3128_defconfig b/configs/evb-rk3128_defconfig
index 6526933..b3fe353 100644
--- a/configs/evb-rk3128_defconfig
+++ b/configs/evb-rk3128_defconfig
@@ -2,7 +2,7 @@
 CONFIG_SKIP_LOWLEVEL_INIT=y
 CONFIG_SYS_ARCH_TIMER=y
 CONFIG_ARCH_ROCKCHIP=y
-CONFIG_SYS_TEXT_BASE=0x60000000
+CONFIG_TEXT_BASE=0x60000000
 CONFIG_NR_DRAM_BANKS=2
 CONFIG_ENV_OFFSET=0x0
 CONFIG_DEFAULT_DEVICE_TREE="rk3128-evb"