lavc/qsvenc_hevc: add -pic_timing_sei option

The SDK may insert picture timing SEI for hevc and the code to set mfx
parameter has been added in qsvenc, however the corresponding option is
missing in the hevc option array

Reviewed-by: Limin Wang <lance.lmwang@gmail.com>
Signed-off-by: Haihao Xiang <haihao.xiang@intel.com>

doc/encoders.texi

@@ -3435,6 +3435,9 @@ Number of rows for tiled encoding.
 
 @item @var{aud}
 Insert the Access Unit Delimiter NAL.
+
+@item @var{pic_timing_sei}
+Insert picture timing SEI with pic_struct_syntax element.
 @end table
 
 @subsection MPEG2 Options

libavcodec/qsvenc_hevc.c

@@ -254,6 +254,7 @@ static const AVOption options[] = {
     { "tile_rows",  "Number of rows for tiled encoding",      OFFSET(qsv.tile_rows),    AV_OPT_TYPE_INT, { .i64 = 0 }, 0, UINT16_MAX, VE },
     { "recovery_point_sei", "Insert recovery point SEI messages",       OFFSET(qsv.recovery_point_sei),      AV_OPT_TYPE_INT, { .i64 = -1 },               -1,          1, VE },
     { "aud", "Insert the Access Unit Delimiter NAL", OFFSET(qsv.aud), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE},
+    { "pic_timing_sei",    "Insert picture timing SEI with pic_struct_syntax element", OFFSET(qsv.pic_timing_sei), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, VE },
 
     { NULL },
 };