[SB Refactor] Add better logging for the mobile icon ID.

Previous logging had `iconId=1028` or `iconId=132096`, which is
difficult to parse.

Bug: 238425913
Test: Manual: Dumped DemoMobileConnectionLog [1] and verified output
Test: atest MobileIconViewModelTest
Change-Id: I8ddeafe4dfb579d9d05e5c23a62bf2e55e256998