fdt: Drop fdt_select.py

This file was used to select between the normal and fallback libfdt
implementations. Now that we only have one, it is not needed.

Drop it and fix up all users.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/binman/control.py b/tools/binman/control.py
index 42d75ef..e9d48df 100644
--- a/tools/binman/control.py
+++ b/tools/binman/control.py
@@ -12,7 +12,7 @@
 import tools
 
 import command
-import fdt_select
+import fdt
 import fdt_util
 from image import Image
 import tout