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/hikey.h b/include/configs/hikey.h
index 5be6eb4..18c1e83 100644
--- a/include/configs/hikey.h
+++ b/include/configs/hikey.h
@@ -17,7 +17,7 @@
 
 /* Physical Memory Map */
 
-/* CONFIG_SYS_TEXT_BASE needs to align with where ATF loads bl33.bin */
+/* CONFIG_TEXT_BASE needs to align with where ATF loads bl33.bin */
 
 #define PHYS_SDRAM_1			0x00000000