msm: rndis_ipa: Adapt driver to 4.9 Linux kernel

Starting Linux kernel 4.7, network device structure
field 'trans_start' is removed. Write access to the
field done now by new API netif_trans_update(net_device).

CRs-fixed: 2016040
Change-Id: I2884245f05832ae2e11fe7731f7f35c15ed0e149
Signed-off-by: Ghanim Fodi <gfodi@codeaurora.org>