Integrate Call Forwarding / Waiting function in Telephony

Test: Treehugger; cts
Bug: 147920077
Change-Id: I56243d4344ca3bc21ddf8269c957cf8bbba0cb03
Merged-In: I56243d4344ca3bc21ddf8269c957cf8bbba0cb03
(cherry picked from commit 4a59405242a30f99a554fca67dce5ac8d54b539f)
1 file changed