Use aom_writer with od_encode_cdf_adapt_q15().

Change the od_encode_cdf_adapt_q15() function to take an aom_writer
 struct instead of an od_ec_enc struct.
Rename od_encode_cdf_adapt_q15() to aom_encode_cdf_adapt_q15().

Change-Id: I631af7be4b553fbb10a4c72e1958aa48a4c8245a
2 files changed