media: MAINTAINERS: Assign Shawn Tu's sensor drivers to myself

Shawn Tu's e-mail address is bouncing:

   shawnx.tu@intel.com
   Remote Server returned '550 5.1.10 RESOLVER.ADR.RecipientNotFound;
   Recipient not found by SMTP address lookup'

Assign the sensor drivers Shawn maintained to myself.

Reported-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>