msm: veth_ipa: Introduce front end network driver

IPA offload Front End Driver Implementation.
This driver creates VETH0 network interface
and is responsible for Initialization and Setup
of offload channels.

Change-Id: Ia664f45c2cf339656dc8e169b184c0ebc1947cf5
Acked-by: Devesh Bisht <dbisht@qti.qualcomm.com>
Signed-off-by: Bojun Pan <bojunp@codeaurora.org>