Use aom_writer with od_encode_pvq_codeword().

Change the od_encode_pvq_codeword() function to take an aom_writer
 struct instead of an od_ec_enc struct.
Rename od_encode_pvq_codeword() to aom_encode_pvq_codeword().

Change-Id: I1254eca06291740770a4371dc01c78c12e613c3a
1 file changed