Add SMS Middleware layer.

Change-Id: I4fff0c584f8fce9c5f2f4fe86a82fe6480c307c7

Conflicts:

	src/java/com/android/internal/telephony/ISms.aidl
	src/java/com/android/internal/telephony/IccSmsInterfaceManager.java
	src/java/com/android/internal/telephony/IccSmsInterfaceManagerProxy.java