Added method to the telephony network finder to look for countries by MCC

New data added in: https://r.android.com/3326205
See more details: go/mcc-table-mainline

Bug: 376493245
Test: manually checked that the device boots normally
Test: atest
Flag: com.android.icu.telephony_lookup_mcc_extension

Change-Id: I8bb2a6d188c2fa374bca6a52f7ca880d260f31eb