patman: Move to absolute imports

At present patman 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 patman to use absolute imports. This requires changes in tools which
use the patman libraries (which is most of them).

Signed-off-by: Simon Glass <sjg@chromium.org>

tools/binman/image.py

@@ -18,8 +18,8 @@ from binman.etype import image_header
 from binman.etype import section
 from dtoc import fdt
 from dtoc import fdt_util
-import tools
-import tout
+from patman import tools
+from patman import tout
 
 class Image(section.Entry_section):
     """A Image, representing an output from binman