Telephony: check if the provisioning apn is actually empty before

checking if they are equal. fixes cases where the stubbed apn
(empty) equal to the the empty provisioning apn.

Change-Id: I6ca4fd172e2ecc64ca7a2c3fbca5327be61e7b5c
Revert "SamsungExynos3RIL: Handle UNSOL_DATA_CALL_LIST_CHANGED."

RIL_UNSOL_DATA_CALL_LIST_CHANGED is already being handled properly
using responseDataCallList in the parent RIL class. Handling it (improperly)
here using responseVoid breaks data connectivity on galaxysmtd in
some circumstances.

This reverts commit d11286f7e96aa4d477ee869b81aef33d91f1b70d.

Change-Id: I3f6b05ecb31049cab2d346a52f244b65bac5f551
Merge remote-tracking branch 'Slim/jb4.3' into slim4.3