Telephony: Define a new property for RUIM based APN operator numeric

PROPERTY_APN_RUIM_OPERATOR_NUMERIC holds the value of mccmnc from CDMA
RUIM/CSIM card and is set by RuimRecords. Applications can use this
to lookup APNs based on RUIM/CSIM mccmnc.

Change-Id: I9e1336ef90d9f002fd226961ffce327ea1422b4a
CRs-Fixed: 626590