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/x86/cpu/u-boot-64.lds b/arch/x86/cpu/u-boot-64.lds
index 53c5604..d0398ff 100644
--- a/arch/x86/cpu/u-boot-64.lds
+++ b/arch/x86/cpu/u-boot-64.lds
@@ -15,8 +15,8 @@
 	/DISCARD/ : { *(__u_boot_list_2_cmd_*) }
 #endif
 
-#ifdef CONFIG_SYS_TEXT_BASE
-	. = CONFIG_SYS_TEXT_BASE;	/* Location of bootcode in flash */
+#ifdef CONFIG_TEXT_BASE
+	. = CONFIG_TEXT_BASE;	/* Location of bootcode in flash */
 #endif
 	__text_start = .;