Contacts: Fail to export 1500 contacts to SIM card

There is a limitation that user can only export 500
contacts to SIM card once.

Modify the limitation to 2000, and prompt how many
contacts have been exported when SIM card is full.

CRs-Fixed: 711982

Change-Id: Id377469a32f90cdffa3d26d63aabf1e8162f5d12