mailmap: add Changbin Du

Add my email in the mailmap file to have a consistent shortlog output.

Link: http://lkml.kernel.org/r/20190308142103.4929-1-changbin.du@gmail.com
Signed-off-by: Changbin Du <changbin.du@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

.mailmap

diff --git a/.mailmap b/.mailmap
index 37e1847..b2cde86 100644
--- a/.mailmap
+++ b/.mailmap
@@ -224,3 +224,5 @@
 Yusuke Goda <goda.yusuke@renesas.com>
 Gustavo Padovan <gustavo@las.ic.unicamp.br>
 Gustavo Padovan <padovan@profusion.mobi>
+Changbin Du <changbin.du@intel.com> <changbin.du@intel.com>
+Changbin Du <changbin.du@intel.com> <changbin.du@gmail.com>