msm: ipa: interface to provide pdn configuration

Make interface changes to get PDN configuration. The ioctl
can be used to notify whether a PDN is in IP collision
mode or in IP passthrough mode and provide the required configuration
information.

Change-Id: I36c596aa449669e5d5b389a1fbdafb6f92a81744
Signed-off-by: Armaan Siddiqui <asiddiqu@codeaurora.org>