Add Uwe Kleine-König to .mailmap

There are a few commits that misencoded my name (or used "oe" instead of
"ö").  So add a correct version to .mailmap.

Signed-off-by: Uwe Kleine-König <ukleinek@informatik.uni-freiburg.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/.mailmap b/.mailmap
index 7260842..dfab12f 100644
--- a/.mailmap
+++ b/.mailmap
@@ -96,4 +96,6 @@
 Thomas Graf <tgraf@suug.ch>
 Tony Luck <tony.luck@intel.com>
 Tsuneo Yoshioka <Tsuneo.Yoshioka@f-secure.com>
+Uwe Kleine-König <Uwe.Kleine-Koenig@digi.com>
+Uwe Kleine-König <ukleinek@informatik.uni-freiburg.de>
 Valdis Kletnieks <Valdis.Kletnieks@vt.edu>