Validate skip_4k option for HDC / USB

[punov]

camera-bridge commit to validate: c2665551ac19a7a986c67d822c4da49323337f80

• Check CPU usage
• Check USB writing + format + FPS (media/usb0/recording)
• check HDC imagery format + FPS (tmp/recording/pic)

[punov]

@jayalberts we'll need to squeeze it into 3.5: it's a very optimisation for camera so we'll not lack CPU resources once we roll out ML

[jayalberts]

no longer applicable. fixed in 3.9 and 4.2 HDC