Support SMS cell broadcasting for GSM in RIL.java

enable gsm related cell broadcast requests in RIL.java and add SmsBraodcastConfigInfo class.

The gsm related cell broadcast requests include

RIL_REQUEST_GET_BROADCAST_CONFIG
RIL_REQUEST_GET_BROADCAST_CONFIG
RIL_REQUEST_BROADCAST_ACTIVATION
RIL_UNSOL_RESPONSE_NEW_BROADCAST_SMS

	modified:   BaseCommands.java
	modified:   CommandsInterface.java
	modified:   RIL.java
	modified:   RILConstants.java
	modified:   cdma/CdmaSMSDispatcher.java
	new file:   gsm/SmsBroadcastConfigInfo.java
	modified:   test/SimulatedCommands.java