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/lx2160ardb_tfa_stmm_defconfig b/configs/lx2160ardb_tfa_stmm_defconfig
index 79b0e47..d10431e 100644
--- a/configs/lx2160ardb_tfa_stmm_defconfig
+++ b/configs/lx2160ardb_tfa_stmm_defconfig
@@ -3,7 +3,7 @@
 CONFIG_GIC_V3_ITS=y
 CONFIG_TARGET_LX2160ARDB=y
 CONFIG_TFABOOT=y
-CONFIG_SYS_TEXT_BASE=0x82000000
+CONFIG_TEXT_BASE=0x82000000
 CONFIG_SYS_MALLOC_LEN=0x202000
 CONFIG_SYS_MALLOC_F_LEN=0x6000
 CONFIG_NR_DRAM_BANKS=3