v4l2videoenc: activate capture pool after output pool

Some drivers need output buffers set before capture buffers.
CODA cannot set output format if capture is streaming.
Exynos MFC fails on output STREAMON if capture is already streaming.
This patch delays capture activation until output is configured and
streaming

https://bugzilla.gnome.org/show_bug.cgi?id=796693
1 file changed