net: rmnet_usb: Use USB_DEVICE_INTERFACE_NUMBER

Use the USB_DEVICE_INTERFACE_NUMBER macro to add the supported
devices and their corresponding interface numbers. This replaces
the cumbersome per-PID bitfield used to map supported interfaces.

Change-Id: I738d79cda929a450086df8fb27247882df8bc696
Signed-off-by: Jack Pham <jackp@codeaurora.org>
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>