Revert "IMS: start and stop dtmf tones"

This reverts commit 596d5f7f034c1ba90e242d91d027918e2c8bbebe.
Revert "IMS-VT: Multitasking feature"

This reverts commit a789970adcfc4b0f62771f6f5e0870b6b3849c05.
Revert "Propagate the call substate changed message to the UI"

This reverts commit 2c295935b7a495e353446222212cd184902f11b8.
Revert "MSIM: Broadcast dds and set uicc request result"

This reverts commit 30f05380b28bbfadfc577eea5b38a7df7c320d0b.
Revert "Add SMS Middleware layer."

This reverts commit 2d65d1ded4fdc42ca45664b99a888725ae9fffcd.

Conflicts:
	src/java/com/android/internal/telephony/IccSmsInterfaceManagerProxy.java
	src/java/com/android/internal/telephony/PhoneProxy.java

Change-Id: I43a6473faaca5416226ca910cc744820e983a65e
Revert "Telephony: Add CallFailCause values for clear code"

This reverts commit 285b499d75109204b042e1893079616551365a8d.