frontends/va: Store picture type for buffers in encode DPB

Reviewed-by: Ruijing Dong <ruijing.dong@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32479>

src/gallium/frontends/va/picture_h264_enc.c

@@ -262,6 +262,8 @@ vlVaHandleVAEncSliceParameterBufferTypeH264(vlVaDriver *drv, vlVaContext *contex
       context->desc.h264enc.picture_type = PIPE_H2645_ENC_PICTURE_TYPE_SKIP;
    }
 
+   context->desc.h264enc.dpb[context->desc.h264enc.dpb_curr_pic].picture_type = context->desc.h264enc.picture_type;
+
    context->desc.h264enc.pic_ctrl.enc_cabac_init_idc = h264->cabac_init_idc;
    context->desc.h264enc.dbk.disable_deblocking_filter_idc = h264->disable_deblocking_filter_idc;
    context->desc.h264enc.dbk.alpha_c0_offset_div2 = h264->slice_alpha_c0_offset_div2;

src/gallium/include/pipe/p_video_state.h

@@ -762,6 +762,7 @@ struct pipe_h264_enc_dpb_entry
    bool is_ltr;
    struct pipe_video_buffer *buffer;
    bool evict;
+   enum pipe_h2645_enc_picture_type picture_type;
 };
 
 struct pipe_h264_enc_picture_desc