media: MAINTAINERS: Pick ov5670 maintenance

Chiranjeevi's e-mail is bouncing:

   chiranjeevi.rapolu@intel.com
   DM3NAM02FT041.mail.protection.outlook.com
   Remote Server returned '550 5.4.1 Recipient address rejected: Access
   denied. AS(201806281)'

Assign the driver to myself.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>