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Optimize vpx_mbpost_proc_across_ip_msa function

Removed HADD_SW_S32 calculation

Change-Id: I7384dc881451d197404d09beb7c27b222e1d6875

--- a/vpx_dsp/mips/deblock_msa.c

+++ b/vpx_dsp/mips/deblock_msa.c

@@ -454,7 +454,7 @@

   v16u8 tmp = { 0 };

   v16i8 zero = { 0 };

   v8u16 sum_h, src_r_h, src_l_h;

-  v4u32 src_r_w, src_l_w;

+  v4u32 src_r_w;

   v4i32 flimit_vec;

   flimit_vec = __msa_fill_w(flimit);

@@ -473,9 +473,8 @@

     src[15] = 0;

     ILVRL_B2_UH(zero, src, src_r_h, src_l_h);

     src_r_w = __msa_dotp_u_w(src_r_h, src_r_h);

-    src_l_w = __msa_dotp_u_w(src_l_h, src_l_h);

+    src_r_w += __msa_dotp_u_w(src_l_h, src_l_h);

     sum_sq = HADD_SW_S32(src_r_w);

-    sum_sq += HADD_SW_S32(src_l_w);

     sum_h = __msa_hadd_u_h(src, src);

     sum = HADD_UH_U32(sum_h);

     {