mips msa vp9 convolve8 avg horiz optimization

average improvement ~5x-8x

Change-Id: I179a69ec620fbd69979bd128f05d18113618aab4
diff --git a/test/convolve_test.cc b/test/convolve_test.cc
index 3793e9b..8565077 100644
--- a/test/convolve_test.cc
+++ b/test/convolve_test.cc
@@ -1818,7 +1818,7 @@
 #if HAVE_MSA
 const ConvolveFunctions convolve8_msa(
     vp9_convolve_copy_msa, vp9_convolve_avg_msa,
-    vp9_convolve8_horiz_msa, vp9_convolve8_avg_horiz_c,
+    vp9_convolve8_horiz_msa, vp9_convolve8_avg_horiz_msa,
     vp9_convolve8_vert_msa, vp9_convolve8_avg_vert_msa,
     vp9_convolve8_msa, vp9_convolve8_avg_c, 0);