The functions aom_encode_pvq_split() and aom_decode_pvq_split() code
 the rest value as raw bits using the od_ec_enc_bits() and
 od_ec_dec_bits() functions.
These code bits in the reverse order as the aom_write_literal() and
 aom_read_literal() functions, so both the encoder and decoder must
 be changed at the same time.
This commit has no impact on metrics but is a bitstream change.

Change-Id: Iee79777f35aebbb23043a7efa7fe439af70348ba