misc: Update .mailmap

This commit updates the mailmap since the initial commit in mid-July
2020: https://gem5-review.googlesource.com/c/public/gem5/+/29672.

`sort -u` has been run on this file so some previous entries have been
moved.

Change-Id: I46df1e9675f6f7057b680ca2abbcebdffd50462a
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/66531
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
1 file changed