msm: ipa4: add VLAN mode to rndis_ipa and ecm_ipa

IPA core driver will receive at boot information about which LAN
interfaces should support VLAN. rndis_ipa and ecm_ipa will query
that info and will register the correct header accordingly.

Change-Id: I9cf0875e94373e06aa6a4200d629e5934199a345
CRs-Fixed: 2156924
Signed-off-by: Amir Levy <alevy@codeaurora.org>