Use aom_reader with od_decode_cdf_adapt_q15().

Change the od_decode_cdf_adapt_q15() function to take an aom_reader
 struct instead of an od_ec_enc struct.
Rename od_decode_cdf_adapt_q15() to aom_decode_cdf_adapt_q15().

Change-Id: I72315c6e89d689e232c53a99a7d4e0f9cdcfbd0c
2 files changed