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/powerpc/dts/u-boot.dtsi b/arch/powerpc/dts/u-boot.dtsi
index 6588bb7..b4b5257 100644
--- a/arch/powerpc/dts/u-boot.dtsi
+++ b/arch/powerpc/dts/u-boot.dtsi
@@ -10,13 +10,13 @@
 / {
 	binman {
 		filename = "u-boot.bin";
-		skip-at-start = <CONFIG_SYS_TEXT_BASE>;
+		skip-at-start = <CONFIG_TEXT_BASE>;
 		sort-by-offset;
 		pad-byte = <0xff>;
 		size = <CONFIG_SYS_MONITOR_LEN>;
 
 		u-boot-with-ucode-ptr {
-			offset = <CONFIG_SYS_TEXT_BASE>;
+			offset = <CONFIG_TEXT_BASE>;
 			optional-ucode;
 		};