Add getOperatorNumeric method in RuimRecords.

Add getOperatorNumeric in RuimRecords in order to
override base class method in IccRecords.

Change-Id: Ia22dd161c6250c34b2408d367ec6565e0439232d
CRs-Fixed: 522455
(cherry picked from commit 32b4c7bfe410801f6a9cb02a6713ccb83ae90617)
(cherry picked from commit 9daaa7516aeee8d0bab3921c15b1496dc98dfa46)
(cherry picked from commit e7409db4aeee441c007ebf4ab9b1767fa20fecf4)