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/a7y17lte_defconfig b/configs/a7y17lte_defconfig
index 952c72b..8c1229d 100644
--- a/configs/a7y17lte_defconfig
+++ b/configs/a7y17lte_defconfig
@@ -3,7 +3,7 @@
 CONFIG_SKIP_LOWLEVEL_INIT=y
 CONFIG_COUNTER_FREQUENCY=26000000
 CONFIG_ARCH_EXYNOS=y
-CONFIG_SYS_TEXT_BASE=0x40001000
+CONFIG_TEXT_BASE=0x40001000
 CONFIG_SYS_MALLOC_F_LEN=0x400
 CONFIG_ARCH_EXYNOS7=y
 CONFIG_TARGET_A7Y17LTE=y