aom_dsp.cmake: add highbd_quantize_intrin_avx2.c

added in:
193422e76 Add avx2 highbd_quantize_b

Change-Id: Ie4ba48042ffd36d69d2bf200bba12a1d924c8f9c
diff --git a/aom_dsp/aom_dsp.cmake b/aom_dsp/aom_dsp.cmake
index 9182d35..d77e959 100644
--- a/aom_dsp/aom_dsp.cmake
+++ b/aom_dsp/aom_dsp.cmake
@@ -363,6 +363,7 @@
 
     set(AOM_DSP_ENCODER_INTRIN_AVX2
         ${AOM_DSP_ENCODER_INTRIN_AVX2}
+        "${AOM_ROOT}/aom_dsp/x86/highbd_quantize_intrin_avx2.c"
         "${AOM_ROOT}/aom_dsp/x86/sad_highbd_avx2.c")
   endif ()