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

Change-Id: I4f7d37af84220971a839f4f8f42aafa1adeb04e4
diff --git a/av1/decoder/decodeframe.c b/av1/decoder/decodeframe.c
index 7006ead..3867e2b 100644
--- a/av1/decoder/decodeframe.c
+++ b/av1/decoder/decodeframe.c
@@ -425,10 +425,10 @@
   // NOTE : we don't use 5 symbols for luma here in aom codebase,
   // since block partition is taken care of by aom.
   // So, only AC/DC skip info is coded
-  const int ac_dc_coded = aom_decode_cdf_adapt(
+  const int ac_dc_coded = aom_read_symbol(
       xd->daala_dec.r,
       xd->daala_dec.state.adapt.skip_cdf[2 * tx_size + (plane != 0)], 4,
-      xd->daala_dec.state.adapt.skip_increment, "skip");
+      "skip");
   if (ac_dc_coded < 0 || ac_dc_coded > 3) {
     aom_internal_error(&cm->error, AOM_CODEC_INVALID_PARAM,
                        "Invalid PVQ Skip Type");