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/pg_wcom_seli8_update_defconfig b/configs/pg_wcom_seli8_update_defconfig
index c7329f1..d144b89 100644
--- a/configs/pg_wcom_seli8_update_defconfig
+++ b/configs/pg_wcom_seli8_update_defconfig
@@ -2,7 +2,7 @@
 CONFIG_SKIP_LOWLEVEL_INIT=y
 CONFIG_COUNTER_FREQUENCY=8333333
 CONFIG_TARGET_PG_WCOM_SELI8=y
-CONFIG_SYS_TEXT_BASE=0x60240000
+CONFIG_TEXT_BASE=0x60240000
 CONFIG_SYS_MALLOC_LEN=0x1004000
 CONFIG_NR_DRAM_BANKS=1
 CONFIG_ENV_SIZE=0x4000