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/include/configs/rpi.h b/include/configs/rpi.h
index 4f5025d..cd8fe8b 100644
--- a/include/configs/rpi.h
+++ b/include/configs/rpi.h
@@ -24,7 +24,7 @@
 
 /* Memory layout */
 #define CONFIG_SYS_SDRAM_BASE		0x00000000
-#define CONFIG_SYS_UBOOT_BASE		CONFIG_SYS_TEXT_BASE
+#define CONFIG_SYS_UBOOT_BASE		CONFIG_TEXT_BASE
 /*
  * The board really has 256M. However, the VC (VideoCore co-processor) shares
  * the RAM, and uses a configurable portion at the top. We tell U-Boot that a