remove a useless copy and specific buffer for all UE UL payload
in UE, the UL payload buffer is duplicated in "a" and "b" buffers remove one buffer and make the remaining one name uniq, as it's visibilty is wide
in UE, the UL payload buffer is duplicated in "a" and "b" buffers remove one buffer and make the remaining one name uniq, as it's visibilty is wide