Fix the physical slot validation and add unit test

Original validation validated physical slot index against the uicc
slot size, but the physical slot index comes from
TelephonyManager.getUiccSlotsInfo, which should be within the upper size
limit. Thus, simplifying the validation and validating against invalid
index only.

Also, the original validation using InValidPhoneId is not always
correct.

For a single SIM device, it may have may have logical slot 0 mapping to
physical slot 1. And it would be falsely invalid because physical slot 1
is equal to the total phone count.

Bug: 129425045
Test: CTS
Change-Id: I40f8359b94d270d54eca118be655517b4e178d34