patman: Add a few more helpers to the tools library
Add functions to read and write a file, looking through a list of search
paths to find it.
Signed-off-by: NSimon Glass <sjg@chromium.org>
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Add functions to read and write a file, looking through a list of search
paths to find it.
Signed-off-by: NSimon Glass <sjg@chromium.org>