avcodec/hevc: Add init for sao_edge_filter

Forgot to init c->sao_edge_filter[idx] when idx=0/1/2/3.
After this patch, the speedup of decoding H265 4K 30FPS
30Mbps on 3A6000 is about 7% (42fps==>45fps).

Change-Id: I521999b397fa72b931a23c165cf45f276440cdfb
Reviewed-by: yinshiyou-hf@loongson.cn
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/loongarch/hevcdsp_init_loongarch.c

@@ -167,6 +167,10 @@ void ff_hevc_dsp_init_loongarch(HEVCDSPContext *c, const int bit_depth)
             c->put_hevc_qpel_uni_w[8][1][1] = ff_hevc_put_hevc_uni_w_qpel_hv48_8_lsx;
             c->put_hevc_qpel_uni_w[9][1][1] = ff_hevc_put_hevc_uni_w_qpel_hv64_8_lsx;
 
+            c->sao_edge_filter[0] = ff_hevc_sao_edge_filter_8_lsx;
+            c->sao_edge_filter[1] = ff_hevc_sao_edge_filter_8_lsx;
+            c->sao_edge_filter[2] = ff_hevc_sao_edge_filter_8_lsx;
+            c->sao_edge_filter[3] = ff_hevc_sao_edge_filter_8_lsx;
             c->sao_edge_filter[4] = ff_hevc_sao_edge_filter_8_lsx;
 
             c->hevc_h_loop_filter_luma = ff_hevc_loop_filter_luma_h_8_lsx;