Share datatype with asterisk-chan-voicemngr
This separates the shared datatype for voicemngr and asterisk-chan-voicemngr(asterisk-chan-voicemngr!40 (merged)).
The new header will be installed on staging-dir(feed/iopsys!762 (merged)) and used by asterisk-chan-voicemngr(feed/openwrt-telephony!95 (merged))
Edited by Wenpeng Song