Force the clock rate of G.722 to be 16000 when using the Google transports as it is 8000 elsewhere.

(closes issue ASTERISK-20105)
Reported by: Malcolm Davenport


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@369838 65c4cc65-6c06-0410-ace0-fbb531ad65f3