1. No need to encode IDR when fps_in is changed. So remove it from
`check_resend_hdr`
2. If application do not want any IDR encoded when only fps is changed,
call `mpp_enc_cfg_s32(cfg, "rc:fps_chg_no_idr", 0);` when
initializing.
3. Keeping CPB when only SPS, PPS are updated without IDR encoded for
H.264 encoder.
Change-Id: I034dd789a3f24318004d942624eb10240f7db2e9
Signed-off-by: Johnson Ding <johnson.ding@rock-chips.com>
b4efbdf9b7