msm: ipa3: Fix to handle zero length frag skb packet

Due to zero length skb packet IPA HW going to stall state.
Adding changes to avoid sending these zero length SKB frag
packets to HW.

Change-Id: I4dae51bf767588095bc1fcd9e10196e913299227
Signed-off-by: Ashok Vuyyuru <avuyyuru@codeaurora.org>