Emergency call related update, REF 16302

Wenpeng Songrequested to merge
wenpeng-02025-efix into asterisk_chan_voicemngr_rdkb
  • refactor the emergency registration flag from global to private.
  • add flag 'e' to un-register cli cmd for emergency registration.(required by asterisk!313 (merged))
Edited by Wenpeng Song

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