mailmap: Chendi Xue name normalization

Signed-off-by: Abhishek Lekshmanan <abhishek.lekshmanan@gmail.com>
mailmap: Sandon Van Ness name normalization

Signed-off-by: Abhishek Lekshmanan <abhishek.lekshmanan@gmail.com>
mailmap: Lei Dong affiliation

Signed-off-by: Abhishek Lekshmanan <abhishek.lekshmanan@gmail.com>
mailmap: Blaine Gardner affiliation

Signed-off-by: Abhishek Lekshmanan <abhishek.lekshmanan@gmail.com>