Change PVQ's skip symbols to use dyadic and ec_adapt adaptation

Change-Id: I4f7d37af84220971a839f4f8f42aafa1adeb04e4
diff --git a/av1/common/pvq_state.c b/av1/common/pvq_state.c
index a9567da..b6fcfb2 100644
--- a/av1/common/pvq_state.c
+++ b/av1/common/pvq_state.c
@@ -13,12 +13,11 @@
 #include "av1/common/odintrin.h"
 
 void od_adapt_ctx_reset(od_adapt_ctx *adapt, int is_keyframe) {
-  int i;
   int pli;
   od_adapt_pvq_ctx_reset(&adapt->pvq, is_keyframe);
-  adapt->skip_increment = 128;
-  OD_CDFS_INIT(adapt->skip_cdf, adapt->skip_increment >> 2);
+  OD_CDFS_INIT_Q15(adapt->skip_cdf);
   for (pli = 0; pli < OD_NPLANES_MAX; pli++) {
+    int i;
     generic_model_init(&adapt->model_dc[pli]);
     for (i = 0; i < OD_TXSIZES; i++) {
       int j;