Fix build issue related to av1_convolve_x_sr_general_avx2()

- Fixed a build issue by replacing with an appropriate function
  call for storing the result of block width 4.

Change-Id: Iee719d943c02fce14c116aec42ca0712830a7269

av1/common/x86/convolve_avx2.c

diff --git a/av1/common/x86/convolve_avx2.c b/av1/common/x86/convolve_avx2.c
index f6ebc15..005d666 100644
--- a/av1/common/x86/convolve_avx2.c
+++ b/av1/common/x86/convolve_avx2.c
@@ -930,7 +930,7 @@
             const __m128i data =
                 convolve_x_2tap_4x2_ssse3(src_ptr, src_stride, coeffs_128);
             const __m128i reg = round_sr_x_ssse3(data);
-            pack_store_4x2_sse2(reg, dst, dst_stride);
+            pack_store_x_4x2_sse2(reg, dst, dst_stride);
             src_ptr += 2 * src_stride;
             dst += 2 * dst_stride;
             h -= 2;