video: introduction of driver for Omnivision OV9655

This commit add support for the Omnivision OV9655 sensor,
a 1.3MPix Color SXGA (1280x1024 sensor).
Current driver only allow output of 320x240 and 160x120
resolution either in RGB565 or YUYV.

Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>