Work around MNC string being only one character

The MNC has between 2 and 3 digits (including leading zeroes) but the
lower level doesn't provide the number of characters/zeroes so let's pad
it to two characters when necessary.

Test: run cts-dev -m CtsTelephonyTestCases -t android.telephony.cts.CellInfoTest#testCellInfo
Issue: FP2A10-44
Change-Id: Iff41d1c686b93e7198cd4d97a548cb354e2ae77e
1 file changed