[MEP] psim's logical slot index is 0

psim's logical slot index is 0, so changing the API and adding test
cases.

Bug: 221839363
Test: atest UiccSlotUtilTest
Change-Id: I1588bd4a2f552a6b41844883b6ad50f1bfec95de
(cherry picked from commit b162438b5df150def448eb56f96d56f1b66e8d16)
2 files changed