FROMGIT: media: amphion: Report the average QP of current encoded frame

Report the average QP value of the current encoded frame via the
V4L2_CID_MPEG_VIDEO_AVERAGE_QP control, the value applies to the last
dequeued capture buffer.

Signed-off-by: Ming Qian <ming.qian@nxp.com>
Signed-off-by: Sebastian Fricke <sebastian.fricke@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

Bug: 352213761
(cherry picked from commit 1034ead1
https: //git.linuxtv.org/media_tree.git master)
Change-Id: Id0c692a236b548cf14d76153142a8631a6506258
Signed-off-by: Zhipeng Wang <zhipeng.wang_1@nxp.com>