patman: add Commit-notes tag and section

Sometimes a commit should have notes enclosed with it rather
than withing the cover letter -- possibly even because there
is no cover letter. Add a 'Commit-notes' tag, similar to the
'Series-notes' one; lines between this tag and the next END
line are inserted in the patch right after the '---' commit
delimiter.

Change-Id: I01e99ae125607dc6dec08f3be8a5a0b37f0a483d
Signed-off-by: Albert ARIBAUD <albert.u.boot@aribaud.net>
Signed-off-by: Simon Glass <sjg@chromium.org>
(Updated README)
diff --git a/tools/patman/README b/tools/patman/README
index e6d3070..59f1776 100644
--- a/tools/patman/README
+++ b/tools/patman/README
@@ -180,6 +180,14 @@
 	together and put after the cover letter. Can appear multiple
 	times.
 
+Commit-notes:
+blah blah
+blah blah
+more blah blah
+END
+	Similar, but for a single commit (patch). These notes will appear
+	immediately below the --- cut in the patch file.
+
  Signed-off-by: Their Name <email>
 	A sign-off is added automatically to your patches (this is
 	probably a bug). If you put this tag in your patches, it will
@@ -227,7 +235,7 @@
 Change-Id:
 Review URL:
 Reviewed-on:
-
+Commit-xxxx: (except Commit-notes)
 
 Exercise for the reader: Try adding some tags to one of your current
 patch series and see how the patches turn out.