[Tizen] Support Video Capture on Geek

This patch enabled the video capture stream for Geek. It gets data from
main device /dev/video0. However, Depending on the implementaion of video
driver, we must simultaneously enable preview device /dev/video2 working
so that we can get data from main device's buffer. Otherwise, the main
device's pipeline will be blocked until the preview device's data is ready.