TeleService: Support call waiting on CDMA phone

There is no call waiting function on CDMA phone.

Support call waiting on CDMA phone.

CRs-Fixed: 694575

Change-Id: Ie51b0981eeca02bb3561c92a4a57f026ca927908
Signed-off-by: anerikg <anerikgames@gmail.com>

Conflicts:
	src/com/android/phone/PhoneGlobals.java