net: usb: qmi_wwan: assume raw IP modeqmi

So far, the driver has assumed that the modem operates in ethernet
mode. While this is true for MDM9x15 in its default mode, it's not
what we want. Android expects RIL data connections to use
point-to-point protocol and integrating dhcp client operations into
the RIL is troublesome. So assume raw IP mode and expect that it's set
in userspace.

Some additional adaptions were necessary to ensure that packets don't
get dropped. They were taken from the rmnet driver while using
the mainline qmi_wwan driver as a reference.

It would be better if it would be possible to switch between the modes
with a sysfs property. This functionality could still be added.

Signed-off-by: Wolfgang Wiedmeyer <wolfgit@wiedmeyer.de>

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