patman: Drop Python 2 StringIO code
We can rely on Python 3 now, so drop the workaround for importing
StringIO.
Signed-off-by: NSimon Glass <sjg@chromium.org>
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We can rely on Python 3 now, so drop the workaround for importing
StringIO.
Signed-off-by: NSimon Glass <sjg@chromium.org>