iface-modem-location: plug memleaks when updating gps raw variant

The helper method returning a variant from a MMLocationGpsRaw would
return already a full variant reference instead of a floating one, so
we were really increasing the refcount when doing g_variant_ref_sink()
in the location interface.

Fix this by consolidating all helper methods in libmm-glib that return
variants from the different MMLocationXX objects, so that they all
return full variants instead of floating ones.

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