xmm,dell: add defaults for MBIM-derived objects
For subclasses of MMBroadbandModemMbim, also apply the same property defaults. E.g. we want to avoid peridic signal quality polling and we also want to report that SIM hot swap is supported.
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For subclasses of MMBroadbandModemMbim, also apply the same property defaults. E.g. we want to avoid peridic signal quality polling and we also want to report that SIM hot swap is supported.