media: venus: Support V4L2 QP parameters in Venus encoder

Support V4L2 QP parameters in Venus encoder:
 * V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP
 * V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP
 * V4L2_CID_MPEG_VIDEO_H264_MIN_QP
 * V4L2_CID_MPEG_VIDEO_H264_MAX_QP

Signed-off-by: Kelvin Lawson <klawson@lisden.com>
Acked-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>