patman: add distutils based installer

To make it easier to use patman on other projects add a distutils style
installer. Now patman can be installed with

cd u-boot/tools/patman && python setup.py

patman: add distutils based installer

To make it easier to use patman on other projects add a distutils style
installer. Now patman can be installed with

cd u-boot/tools/patman && python setup.py install

There are also the usual distutils options for creating source/binary
distributions of patman.

Tested-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Chris Packham <judge.packham@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>

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