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/board/intel/edison/Kconfig b/board/intel/edison/Kconfig
index 23b2af4..5efda4b 100644
--- a/board/intel/edison/Kconfig
+++ b/board/intel/edison/Kconfig
@@ -15,7 +15,7 @@
 config SYS_MALLOC_LEN
 	default 0x08000000
 
-config SYS_TEXT_BASE
+config TEXT_BASE
 	default 0x01101000
 
 config ROM_TABLE_ADDR