media: MAINTAINERS: add entry for ov9650 driver

This adds an entry to the MAINTAINERS file for ov9650 driver.  The
following persons are added in this entry.

* Sakari as a person who looks after media sensor driver patches
* Sylwester as a module author
* Myself as a person who has the hardware and can test the patches

Cc: Jacopo Mondi <jacopo@jmondi.org>
Cc: H. Nikolaus Schaller <hns@goldelico.com>
Cc: Hugues Fruchet <hugues.fruchet@st.com>
Cc: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Cc: Rob Herring <robh@kernel.org>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Reviewed-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Acked-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>