sandbox: Move the bloblist down a little in memory

Move this down by 4KB so that it is large enough to hold the devicetree.

Also fix up the devicetree address in the documetation while we are here.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/test/lib/kconfig.c b/test/lib/kconfig.c
index 76225ba..3914f69 100644
--- a/test/lib/kconfig.c
+++ b/test/lib/kconfig.c
@@ -22,9 +22,9 @@
 	ut_asserteq(0, CONFIG_IS_ENABLED(OF_PLATDATA));
 	ut_asserteq(0, CONFIG_IS_ENABLED(_UNDEFINED));
 
-	ut_asserteq(0xc000,
+	ut_asserteq(0xb000,
 		    IF_ENABLED_INT(CONFIG_BLOBLIST_FIXED, CONFIG_BLOBLIST_ADDR));
-	ut_asserteq(0xc000,
+	ut_asserteq(0xb000,
 		    CONFIG_IF_ENABLED_INT(BLOBLIST_FIXED, BLOBLIST_ADDR));
 
 	/*