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/nsim_hs38_defconfig b/configs/nsim_hs38_defconfig
index 9b85dc4..1afabe6 100644
--- a/configs/nsim_hs38_defconfig
+++ b/configs/nsim_hs38_defconfig
@@ -2,7 +2,7 @@
 CONFIG_ISA_ARCV2=y
 CONFIG_TARGET_NSIM=y
 CONFIG_NSIM_BOARD_CPPFLAGS="-mcpu=archs"
-CONFIG_SYS_TEXT_BASE=0x81000000
+CONFIG_TEXT_BASE=0x81000000
 CONFIG_SYS_MALLOC_LEN=0x0200000
 CONFIG_SYS_MALLOC_F_LEN=0x400
 CONFIG_DEFAULT_DEVICE_TREE="nsim"