Currently RX nbuf data pointer is reset considering
headroom reserve size of NET_SKB_PAD. So while reattaching
buffer back to H.W always data pointer is reset back to head plus
NET_SKB_PAD offset. But if skb is not allocated with head room
reserve then we should not reset data pointer taking NET_SKB_PAD
as consideration.
Fix this by pushing nbuf data pointer back to the state when
nbuf entered the host.
Change-Id: I1c3838a54f87f747e3695e86e54e0e663ba4f182
CRs-Fixed: 3582877
89c1955cd1