radeonsi/vce: Only send one task per IB

There is no need to use second task for config when creating the
session, also it doesn't work now as we don't set the next task
offset in task info anymore.

Fixes: 9ca1cda2be ("radeonsi/vce: Cleanup")
Reviewed-by: Ruijing Dong <ruijing.dong@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34894>

src/gallium/drivers/radeonsi/radeon_vce.c

@@ -662,7 +662,6 @@ static void rdo(struct rvce_encoder *enc)
 
 static void config(struct rvce_encoder *enc)
 {
-   task_info(enc, 0x00000002, 0xffffffff);
    rate_control(enc);
    config_extension(enc);
    motion_estimation(enc);
@@ -928,6 +927,7 @@ static void rvce_begin_frame(struct pipe_video_codec *encoder, struct pipe_video
 
    if (need_rate_control) {
       session(enc);
+      task_info(enc, 0x00000002, 0xffffffff);
       config(enc);
       flush(enc, PIPE_FLUSH_ASYNC, NULL);
    }