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/gardena-smart-gateway-at91sam.h b/include/configs/gardena-smart-gateway-at91sam.h
index 331e9ca..635d0f0 100644
--- a/include/configs/gardena-smart-gateway-at91sam.h
+++ b/include/configs/gardena-smart-gateway-at91sam.h
@@ -42,7 +42,7 @@
 #define CONFIG_SYS_MCKR_CSS		0x1302
 
 #define CONFIG_SYS_NAND_U_BOOT_SIZE	0xa0000
-#define	CONFIG_SYS_NAND_U_BOOT_START	CONFIG_SYS_TEXT_BASE
-#define CONFIG_SYS_NAND_U_BOOT_DST	CONFIG_SYS_TEXT_BASE
+#define	CONFIG_SYS_NAND_U_BOOT_START	CONFIG_TEXT_BASE
+#define CONFIG_SYS_NAND_U_BOOT_DST	CONFIG_TEXT_BASE
 
 #endif