Vectornav VN doesn't send a meaningful GPS_SOL message

[podhrmic]

Figure out how to make Vectornav INS work with GPS_SOL. Currently if we want the pacc values, we have to enable GPS_INT message explicitly.

[podhrmic]

Closing for time out. I don't have a good idea how to do this. All the variables except gps.pdop are already being set, so not sure what else needs to happen.
GPS_SOL is sent automatically by the gps subsystem.

[podhrmic]

For reference, this is the message GPS subsystem is sending for each satelite:

<message name="SVINFO" id="25">
      <field name="chn" type="uint8"/>
      <field name="SVID" type="uint8"/>
      <field name="Flags" type="uint8"/>
      <field name="QI" type="uint8"/>
      <field name="CNO" type="uint8" unit="dbHz"/>
      <field name="Elev" type="int8" unit="deg"/>
      <field name="Azim" type="int16" unit="deg"/>
    </message>

Then the gps state struct holds:

 struct SVinfo svinfos[GPS_NB_CHANNELS]; ///< holds information from the Space Vehicles (Satellites)

Normally this is one of the UBlox messages. Vectornav doesn't provide such info, hence it is not really possible to emulate it.