combo-layer: fix revlist taking into account file_filter
If file_filter is set, git format-patch takes account but git rev-list
does not. So revlist is going to get with wrong revisions. And last_revision
will be updated with wrong revision. The next time that user run
combo-layer it complain about applying patches.
So ensure that 'git rev-list' are using file_filter as 'git format-patch'.
Signed-off-by: João Henrique Ferreira de Freitas <joaohf@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
