The IP Configuration data structure does not match any of the existing
data structure serialization conventions in the rest of the MBIM
specification. So add IPv4 / v6 specific extractors for IPV4 address
and IPV4 Element structures.
SMS_SEND uses an embedded databuffer inside MBIM_SET_SMS_SEND which
wants to use a local offset (local to the databuffer structure) as
opposed to the offset from the start of the static buffer.