Revert "fresnel-fourier iter5b Phase 6 commit B: state-tracking — request.h field + config.c wire-up"

This reverts commit f8256e6c2d.

src/request.h

@@ -96,23 +96,9 @@ struct request_data {
 	 * probes with small surfaces then re-allocates at real
 	 * resolution; we re-set the OUTPUT format whenever this pair
 	 * changes).
-	 *
-	 * iter5b: extended with last_output_pixelformat so the gate
-	 * also fires on codec change (consumer decodes H.264 first,
-	 * HEVC second on the same driver_data). Pre-iter5b the OUTPUT
-	 * pixel format was hardcoded V4L2_PIX_FMT_H264_SLICE in
-	 * CreateSurfaces2, so codec change was silent and HEVC / VP9 /
-	 * VP8 saw the kernel hantro driver substitute MPEG2_DECODER
-	 * codec_mode (when bound to hantro) or rkvdec silently drop
-	 * the decode (when bound to rkvdec). Same bug class as iter4's
-	 * unconditional h264_start_code; both fixes thread the active
-	 * profile into codec-specific kernel state.
-	 *
-	 * 0 = uninitialized; non-zero = FOURCC of current OUTPUT format.
 	 */
 	unsigned int last_output_width;
 	unsigned int last_output_height;
-	unsigned int last_output_pixelformat;
 };
 
 VAStatus VA_DRIVER_INIT_FUNC(VADriverContextP context);