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/doc/board/intel/minnowmax.rst b/doc/board/intel/minnowmax.rst
index 0281217..1ba25b5 100644
--- a/doc/board/intel/minnowmax.rst
+++ b/doc/board/intel/minnowmax.rst
@@ -56,7 +56,7 @@
 500000   <spare>
 6ef000   Environment         CONFIG_ENV_OFFSET
 6f0000   MRC cache           CONFIG_ENABLE_MRC_CACHE
-700000   u-boot-dtb.bin      CONFIG_SYS_TEXT_BASE
+700000   u-boot-dtb.bin      CONFIG_TEXT_BASE
 7b0000   vga.bin             CONFIG_VGA_BIOS_ADDR
 7c0000   fsp.bin             CONFIG_FSP_ADDR
 7f8000   <spare>             (depends on size of fsp.bin)