Correct max len when build ANR data

The numberToCalledPartyBCD function has considered the TON/TPI byte,
So the Max length should add TON/TPI byte, Or else the max additional
number will delete last two numbers. Please refer to 3GPP TS 31.102

CRs-Fixed: 739292

Change-Id: Ic469cff4d6b83cfcda96a77f7a70ca542a198350