Fix parseInt format exception.

In the radio logs I see the following exception:
08-09 14:41:27.849 E/GsmSST  ( 1006): [GsmSST] error parsing RegistrationState: java.lang.NumberFormatException: Invalid int: "ffffffff"

The issue is that parseInt doesn't go to 0xffffffff.
parseLong does and it returns -1 when passed ffffffff

Change-Id: Ie98873cefb551cc88075d39b64164b130130d0e0