mailmap: add entry for Enric Balletbo i Serra

Map Enric's old corporate addresses to his kernel.org address.

Link: https://lkml.kernel.org/r/20230314115455.188818-1-eballetbo@kernel.org


Signed-off-by: Enric Balletbo i Serra <eballetbo@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>