mailmap: update Dan Carpenter's email address

My time at Oracle is ending at the end of the month.  Update my email
address accordingly.

Link: https://lkml.kernel.org/r/Y0a+6+5SHMdvUnpg@kili


Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>