patman: Move library functions into a library directory

The patman directory has a number of modules which are used by other tools
in U-Boot. This makes it hard to package the tools using pypi since the
common files must be copied along with the tool that uses them.

To address this, move these files into a new u_boot_pylib library. This
can be packaged separately and listed as a dependency of each tool.

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
-from patman import tools
-from patman import tout
+from u_boot_pylib import tools
+from u_boot_pylib import tout
 
 class Image(section.Entry_section):
     """A Image, representing an output from binman