flex: Refresh patch

The patch changes the same file twice which causes issues with some patch
tools (not used in YP by default). Refresh the patch to clean this up
anyway.

RP: Tweak commit message
Signed-off-by: Zang Ruochen <zangrc.fnst@cn.fujitsu.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit cb6e65f8)
Signed-off-by: Steve Sakoman <steve@sakoman.com>