Add VoLTE preferred set and query function
add Set and query function, user can set/query volte proferred on/off status in wireless setting screen; UI will restore the status, if modem status don't match ui, then ui will automatic set it. Change-Id: I8a4f30b357a6e69538ded9a477bb0ffed5c3fb9d CRs-Fixed: 1063182
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