Fix incorrect broadcast of UiccCarrierPrivilegesRules loaded event.

When a registrant registers for carrier privileges
rules loaded event, UiccCarrierPrivilegeRules instance
is checked for null. If null, the registrant is
erroneously notified that the carrier privileges rules
has been loaded.

In the register api, notify the registrant only if the instance
is not null and if the carrier privilege rules have been loaded.

CRs-Fixed: 723955

Conflicts:
src/java/com/android/internal/telephony/uicc/UiccCard.java
Change-Id: I048578e5eb66290f2a268c64ad355af31bd701cf