Fix vp9_psnrhvs.c build error

Add vpx_dsp_rtcd.h to the header file list. The od_bin_fdct8x8()
here depends on forward 8x8 2D-DCT.

Change-Id: I1d71edc71f07069808823d2445c1cafd285e1b94

vp9/encoder/vp9_psnrhvs.c

@@ -16,6 +16,7 @@
 
 #include "./vpx_config.h"
 #include "./vp9_rtcd.h"
+#include "./vpx_dsp_rtcd.h"
 #include "vp9/encoder/vp9_ssim.h"
 
 #if !defined(M_PI)