media: MAINTAINERS: Orphan the OV7740 driver

Wenyou's email is bouncing, remove him from this camera driver's entry
and mark it as orphan.

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