msm: ipa3: add support for WAN pipes in MHI mode

IPQ+SDx55 device configuration requires the embedded use case.
Make changes to configure WAN pipes in MHI configuration.

Change-Id: I52d732fcd858c414d7b4f9efc2d4fa8ad76b7b9b
Acked-by: Chaitanya Pratapa <cpratapa@qti.qualcomm.com>
Signed-off-by: Bojun Pan <bojunp@codeaurora.org>
Signed-off-by: Chaitanya Pratapa <cpratapa@codeaurora.org>