msdk: bufferpool: set alignment to video meta

else gst_video_meta_validate_alignment will report error like "videometa gstvideometa.c:416:gst_video_meta_validate_alignment: Stride of plane 0 defined in meta (384) is different from the one computed from the alignment (320)"

@haihao please help review the patch.thanks

LGTM, could you submit a PR to https://github.com/intel-media-ci/gst-plugins-bad/ to check whether it causes any regression?

great! thanks @ullysses.a.eoff @haihao , could you help merge this? thanks

resolved all threads

added 69 commits

• 31bb00d3...0dfd05e5 - 68 commits from branch gstreamer:master
• b0add29f - msdk: bufferpool: set alignment to video meta

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assigned to @gstreamer-merge-bot

mentioned in commit XuGuangxin/gst-plugins-bad@cab1ddf4

added 1 commit

• cab1ddf4 - msdk: bufferpool: set alignment to video meta

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merged

changed milestone to %1.17.1