Camera: add external camera fps control

V4L2 doesn't seem to allow changing fps at runtime, so we need to
wait until pipeline is idle and reconfigure V4L2 streams.

Also update the fps filtering logic to make sure supported fps
are consistent as long as the major dimension is the same.
Ex: for 4:3 webcams, all 1280*N sizes has the same fps set, or
    for 16:9 webcams, all N*720 sizes has the same fps set.

Bug: 72261912
Change-Id: I534f09bebadb2f532a030a841633a8be7d3a87cc