aom_dsp_rtcd_defs: add 2 missing avx2 sad fn defs

The rtcd entries for aom_sad_skip_16x4x4d_avx2, aom_sad16x4x3d_avx2 were
missed in:

591a1189cc AVX2: Add optimization for sad_16xhx4d
a4c4f18c7e AVX2: Add optimization for sad_mxnx3d

Bug: aomedia:3416, aomedia:3358
Change-Id: I956c5c45f650c06f7aae9911f8b260c83091caa8
diff --git a/aom_dsp/aom_dsp_rtcd_defs.pl b/aom_dsp/aom_dsp_rtcd_defs.pl
index 5c4a787..7d8cfb9 100755
--- a/aom_dsp/aom_dsp_rtcd_defs.pl
+++ b/aom_dsp/aom_dsp_rtcd_defs.pl
@@ -1087,7 +1087,7 @@
   specialize qw/aom_sad_skip_16x32x4d   avx2 sse2 neon neon_dotprod/;
   specialize qw/aom_sad_skip_16x16x4d   avx2 sse2 neon neon_dotprod/;
   specialize qw/aom_sad_skip_16x8x4d    avx2 sse2 neon neon_dotprod/;
-  specialize qw/aom_sad_skip_16x4x4d              neon neon_dotprod/;
+  specialize qw/aom_sad_skip_16x4x4d    avx2      neon neon_dotprod/;
   specialize qw/aom_sad_skip_8x32x4d         sse2 neon/;
   specialize qw/aom_sad_skip_8x16x4d         sse2 neon/;
   specialize qw/aom_sad_skip_8x8x4d          sse2 neon/;
@@ -1116,7 +1116,7 @@
   specialize qw/aom_sad64x16x3d   avx2 neon neon_dotprod/;
   specialize qw/aom_sad32x8x3d    avx2 neon neon_dotprod/;
   specialize qw/aom_sad16x64x3d   avx2 neon neon_dotprod/;
-  specialize qw/aom_sad16x4x3d         neon neon_dotprod/;
+  specialize qw/aom_sad16x4x3d    avx2 neon neon_dotprod/;
   specialize qw/aom_sad8x32x3d         neon/;
   specialize qw/aom_sad4x16x3d         neon/;
 
diff --git a/test/sad_test.cc b/test/sad_test.cc
index 5212748..64cf800 100644
--- a/test/sad_test.cc
+++ b/test/sad_test.cc
@@ -3202,6 +3202,7 @@
   make_tuple(32, 8, &aom_sad_skip_32x8x4d_avx2, -1),
 
   make_tuple(16, 64, &aom_sad_skip_16x64x4d_avx2, -1),
+  make_tuple(16, 4, &aom_sad_skip_16x4x4d_avx2, -1),
 #endif
 };
 
@@ -3294,6 +3295,7 @@
 #if !CONFIG_REALTIME_ONLY
   make_tuple(32, 8, &aom_sad32x8x3d_avx2, -1),
   make_tuple(64, 16, &aom_sad64x16x3d_avx2, -1),
+  make_tuple(16, 4, &aom_sad16x4x3d_avx2, -1),
 #endif  // !CONFIG_REALTIME_ONLY
 
 #if CONFIG_AV1_HIGHBITDEPTH