msm: ipa3: reset skb header before passing it to NW stack

This ensures the network stack that skb->network_header
sits in the valid range of skb->data to skb->tail.

Change-Id: I6061eddc81cb2e9bd0e4d52ceddab792c332e15c
Signed-off-by: Jagadeesh Ponduru <quic_jponduru@quicinc.com>