Use "git cherry" against the original tag that we made when we extracted
the source in order to find the revisions that are definitely new. This
allows you to modify a commit in the middle of the series and then run
devtool update-recipe and not have the subsequent patches unnecessarily
modified.
Fixes [YOCTO #8388].
(From OE-Core rev: 7baf57ad896112cf2258b3e2c2a1f8b756fb39bc)
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>