binman: Move to absolute imports

At present binman sets the python path on startup so that it can access
the libraries it needs. If we convert to use absolute imports this is not
necessary.

Move binman to use absolute imports. This enables removable of the path
adjusting in Entry also.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/binman/image.py b/tools/binman/image.py
index 3e96173..50bd57c 100644
--- a/tools/binman/image.py
+++ b/tools/binman/image.py
@@ -12,12 +12,12 @@
 import re
 import sys
 
-from entry import Entry
-from etype import fdtmap
-from etype import image_header
-from etype import section
-import fdt
-import fdt_util
+from binman.entry import Entry
+from binman.etype import fdtmap
+from binman.etype import image_header
+from binman.etype import section
+from dtoc import fdt
+from dtoc import fdt_util
 import tools
 import tout