msdkvpp: deprecate mirror and rotation and use video-direction

msdkvpp wrongly added a rotation property when video-direction property is commonly used in gstreamer. rotation shall be marked as deprecated and add video-direction

cc: @haihao

@vjaquez Thanks for filing this issue, I will make a patch for it.

FYI, we just recently implemented video-direction in vaapipostproc (gstreamer-vaapi). You might be able to use it as a reference. And videoflip element did a similar "deprecation" which you can use for reference, too. Hope it's helpful.

@ullysses.a.eoff Thanks for the info.

mentioned in commit haihao/gst-plugins-bad@bf42832d

mentioned in merge request !646 (merged)

mentioned in commit haihao/gst-plugins-bad@c4ba8b69

mentioned in commit haihao/gst-plugins-bad@d5fd9bc2

closed via commit d5fd9bc2

mentioned in commit haihao/gst-plugins-bad@75630b28