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>
diff --git a/tools/binman/control.py b/tools/binman/control.py
index d715b60..dc1dd2a 100644
--- a/tools/binman/control.py
+++ b/tools/binman/control.py
@@ -8,12 +8,12 @@
 from collections import OrderedDict
 import os
 import sys
-import tools
+from patman import tools
 
 from binman import cbfs_util
 from binman import elf
-import command
-import tout
+from patman import command
+from patman import tout
 
 # List of images we plan to create
 # Make this global so that it can be referenced from tests