Added debug message

Added debug message to print sub id when carrier
config event is fired.

Test: Manual
Bug: 152149072
Merged-In: Iabb432476849204624d1002d05ba0f1bf1ac5316
Change-Id: Iabb432476849204624d1002d05ba0f1bf1ac5316
(cherry picked from commit f7f4d1e4c2e1754bb2ee5358578790fcd2b8650e)
1 file changed