[Bug 733827] v4l2videodec: Add pixel format negotiation support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=733827

--- Comment #6 from Philipp Zabel <p.zabel at pengutronix.de> ---
The coda can decode h.264 into either I420 or NV12, but currently only I420 can
be used because v4l2videodec never calls S_FMT(CAP) with a format negotiated
with the src pad peer.

I need to do (roughly) the following:
1. S_FMT(OUT)
2. REQBUFS(OUT)
3. STREAMON(OUT)
4. QBUF(OUT)
5. G_FMT(CAP)
6. ENUM_FMT(CAP) <- chose one of these formats depending on src pad peer
7. S_FMT(CAP)
8. REQBUFS(CAP)
9. STREAMON(CAP)
The v4l2videodec element currently doesn't to 6. and 7., which this patch
intends to add. I can't use the cached probed_caps in place of 6. because the
driver may have disabled some formats depending on the encoded data.

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