Avoid IMEI overrided by getSummary() for dual SIM condition

IMEI information will be overrided by getSummary() and cause second slot IMEI is
oerrided by first slot.
Avoid IMEI is override by first slot information.

Bug: 131124169
Test: Test with dual SIM device and atest
ImeiInfoPreferenceControllerTest, ImeiInfoDialogControllerTest pass

Change-Id: Ia0a028aa0103867f42fff610129cf7ce2d3910b7