mailmap, MAINTAINERS, docs: update Carlos's email address

Update .mailmap to reflect my new (and final) primary email address,
carlos.bilbao@kernel.org.  Also update contact information in files
Documentation/translations/sp_SP/index.rst and MAINTAINERS.

Link: https://lkml.kernel.org/r/20250130012248.1196208-1-carlos.bilbao@kernel.org


Signed-off-by: Carlos Bilbao <carlos.bilbao@kernel.org>
Cc: Carlos Bilbao <bilbao@vt.edu>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Mattew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>