Support user setting for vui_parameters_present_flag.
1. Default vui enable flag is true if not setting.
2. Call mpp_enc_cfg_set_s32(cfg, "h264:vui_en", vui_en) or
mpp_enc_cfg_set_s32(cfg, "h265:vui_en", vui_en) to
enable or disable the vui enable flag.
Platform: all
Spec: all
Reported-by: #556121 at redmine
Change-Id: Ie4a23c2879c3209377a5800d8e63c4081c34e0f7
Signed-off-by: wyc <yichen.wang@rock-chips.com>