[Bug 794998] omxvideoenc: restore OMX default target-bitrate if requested by user

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=794998

--- Comment #2 from Guillaume Desmottes <gdesmott at gnome.org> ---
Created attachment 370550
  --> https://bugzilla.gnome.org/attachment.cgi?id=370550&action=edit
omxvideoenc: use gst_omx_video_enc_set_bitrate() when setting bitrate in
set_format

We weren't using the usual pattern when re-setting the bitrate:
- get parameters from OMX
- update only the fields different from 0xffffffff (OMX defaults)
- set parameters

Also added a comment explaining why we re-set this param.

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