Telephony: Always allow ignored sms packages for premium sms.

  Also clean up redundant code by creating a new method (resolvePackageName).

Change-Id: I14eafe2c1ae007c1a8d9c1270a832a2c92f3a04e
(cherry picked from commit 9e7b80a78a156b729e6fe92636494d900404d138)