Use aom_reader with od_decode_cdf_adapt().

Change the od_decode_cdf_adapt() function to take an aom_reader
 struct instead of an od_ec_dec struct.
Rename od_decode_cdf_adapt() to aom_decode_cdf_adapt().

Change-Id: I0713d2f56acfea3f67f1b4087c0feee77c2e25cb
5 files changed