Avoid ArrayIndexOutOfBoundsException thrown because of unexpected slot

Actually it is not expected to receive many slot information from the
underlying implementation than expected. However, just making
mUiccSlots[] throw ArrayIndexOutOfBoundsException is also not good.
It is better to check the propagated slot information and put error log.

Bug: 143918247
Test: Confirmed that unexpected slot does not cause the exception.

Change-Id: I003bacfa442dd2da878f4082218e63e561bbb75c