usbcam: fix rendering failure in 720p mode

  * check v4l2 format parameter settings
  * add option of '--resolution' in test-device-manager for usbcam
  * test command:
    test-device-manager -m dma -f YUYV -d video -e overlay -p \
        --usb /dev/videoX --resolution 1280x960

Signed-off-by: Wind Yuan <feng.yuan@intel.com>
2 files changed