power: supply: max77976: update Luca Ceresoli's e-mail address

My Bootlin address is preferred from now on.

Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>