binman: Workaround lz4 cli padding in test cases

binman: Workaround lz4 cli padding in test cases

Newer lz4 util is not happy with any padding at end of file,
it would abort with error message like:

Stream followed by undecodable data at position 43.

Workaround by skipping testCompUtilPadding test case and manually
strip padding in testCompressSectionSize test case.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
Tested-by: Mattijs Korpershoek <mkorpershoek@kernel.org>