huawei: enable setting LTE bands via SYSCFGEX
As the title says, allow users to set LTE bands for AT-based Huawei modems via ^SYSCFGEX,
with fallback to the previously used ^SYSCFG.
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As the title says, allow users to set LTE bands for AT-based Huawei modems via ^SYSCFGEX,
with fallback to the previously used ^SYSCFG.