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>

tools/binman/state.py

@@ -8,7 +8,7 @@
 import hashlib
 import re
 
-import fdt
+from dtoc import fdt
 import os
 import tools
 import tout
@@ -167,8 +167,8 @@ def Prepare(images, dtb):
     global output_fdt_info, main_dtb, fdt_path_prefix
     # Import these here in case libfdt.py is not available, in which case
     # the above help option still works.
-    import fdt
-    import fdt_util
+    from dtoc import fdt
+    from dtoc import fdt_util
 
     # If we are updating the DTBs we need to put these updated versions
     # where Entry_blob_dtb can find them. We can ignore 'u-boot.dtb'