QVGA support for the m5602 camera

I've been experimenting the last days with enabling different resolutions during my commute to and from work.

Today I've finally cracked the way to setup the camera and can successfully produce 320x240 frame, enabling a much higher framerate.

Expect to see some patches coming down the pipes in the coming days.
Sad thing that I only can support the ov9650 sensor. But as the datasheets are still lacking that's where we are.