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/arch/arm/dts/rockchip-optee.dtsi b/arch/arm/dts/rockchip-optee.dtsi
index cde9b81..328ba90 100644
--- a/arch/arm/dts/rockchip-optee.dtsi
+++ b/arch/arm/dts/rockchip-optee.dtsi
@@ -21,7 +21,7 @@
 					os = "U-Boot";
 					arch = "arm";
 					compression = "none";
-					load = <CONFIG_SYS_TEXT_BASE>;
+					load = <CONFIG_TEXT_BASE>;
 
 					u-boot-nodtb {
 					};