mailmap, docs: update email to carlos.bilbao@kernel.org

mailmap, docs: update email to carlos.bilbao@kernel.org

Update .mailmap to reflect my new (and final) primary email address,
carlos.bilbao@kernel.org.  This ensures consistent attribution in Git
history.  Also update my contact information in file
Documentation/translations/sp_SP/index.rst to help contributors reach out
for Spanish translations.

Link: https://lkml.kernel.org/r/20250111161110.862131-1-carlos.bilbao@kernel.org
Signed-off-by: Carlos Bilbao <carlos.bilbao@kernel.org>
Cc: Avadhut Naik <avadhut.naik@amd.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>