CDMA: fix China CDMA card cannnot select APN list issue

This issue found in China Telecomm operator, the
PROPERTY_APN_SIM_OPERATOR_NUMERIC value cannot be recognized correctly
in UICCRecords. This will cause APN list cannot be displayed in setting menu.
So I refer to SIMRecords implement and re-read IMSI in
UICC records.
After apply this patch, the PROPERTY_APN_SIM_OPERATOR_NUMERIC is correct vaule
and the APN list can be displayed in setting menu.

Change-Id: Ifd4eed5f774cdd9322646a75c14348f9dee6d77d