mailmap: update entry for Bartosz Golaszewski

My linaro address will stop working tonight. Update my mailmap entry.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Bartosz Golaszewski <[e-mail]>
Cc: Hans Verkuil <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

.mailmap

···
 Barry Song <[e-mail]> <[e-mail]>
 Bart Van Assche <[e-mail]> <[e-mail]>
 Bart Van Assche <[e-mail]> <[e-mail]>
-Bartosz Golaszewski <[e-mail]> <[e-mail]>
+Bartosz Golaszewski <[e-mail]> <[e-mail]>
+Bartosz Golaszewski <[e-mail]> <[e-mail]>
 Ben Dooks <[e-mail]> <[e-mail]>
 Ben Dooks <[e-mail]> <[e-mail]>
 Ben Gardner <[e-mail]>