defconfig: sdxpoorwills-auto: Enable USB IPC and RNDIS drivers

Enable IPC router USB transport, USB IPC function and SW path
based USB RNDIS function drivers for auto.

Change-Id: I27925f48a868307e0b4c05f0e9b0de7720b9d530
Signed-off-by: Aditya Mathur <aditmath@codeaurora.org>